A black dorsal fin breaks the surface.

Someone says:

“Orca!”

A few minutes later, a much larger dark back rises farther across the fjord.

There is a blow.

Then an enormous tail disappears beneath the water.

Humpback whale.

During Northern Norway's winter whale season, these are the two species many travellers most hope to encounter.

Both may be searching for the same thing:

herring.

But almost everything else about them is different.

An orca is the world's largest member of the dolphin family: fast, highly social, toothed and capable of sophisticated cooperative hunting.

A humpback is a huge baleen whale: far larger, built to engulf enormous quantities of prey-filled water and strain the food through plates of baleen.

Their silhouettes are different.

Their feeding strategies are different.

Their social lives are different.

And from the deck of a whale-watching vessel, the encounters often feel completely different too.

Here is how to recognise them—and understand what you are actually watching.

Orca vs Humpback Whale: The Quick Difference

If you only remember a few things, remember these:

Orca

• ‍‍Scientific name: Orcinus orca
• Animal group: Dolphin family
• Main visual clue: Tall dorsal fin + black-and-white body
• Feeding equipment: Teeth
• Typical winter prey in Northern Norway: Strongly associated with herring and schooling fish
• Social style: Often seen in pods/groups
• Surface impression: Faster, more agile, multiple fins
• Famous behaviour: Coordinated hunting

Humpback whale

• ‍‍Scientific name: Megaptera novaeangliaea
• Animal group: Baleen whale
• Main visual clue: Huge dark back + small dorsal fin + large tail
• Feeding equipment: Baleen
• Typical winter prey in Northern Norway: Herring and other small schooling fish
• Social style: Often alone or in smaller temporary feeding associations
• Surface impression: Larger, slower-looking body, powerful surfacing
• Famous behaviour: Lunge feeding, fluking, occasional breaches

Those differences are easy to describe on paper.

At sea, however, you often have only a few seconds to identify what has surfaced.

Let's look more closely.

First: An Orca Is Actually a Dolphin

The name killer whale can be misleading.

Orcas are cetaceans, just like other whales and dolphins, but taxonomically they belong to the dolphin family, Delphinidae.

In fact, they are the largest members of that family.

According to NOAA Fisheries' killer whale profile, the largest individuals can approach 10 metres in length, although size differs between sexes and populations.

That body is designed for active predation.

Orcas have:

• Teeth
• Powerful tails
• Strong pectoral fins
• Excellent hearing
• Echolocation
• Complex vocal communication
• Highly developed social behaviour

Most importantly for whale watching in Northern Norway:

they often operate as a group.

What Does an Orca Look Like from the Boat?

Orcas are among the easiest cetaceans to recognise when conditions are good.

Look for:

Black and white colouring

The body is primarily black, with:

• White underside
• White eye patch
• Grey or whitish saddle patch behind the dorsal fin

A prominent dorsal fin

This is often the first thing you see.

Adult males can develop extremely tall, upright dorsal fins.

Females and younger animals generally have shorter, more curved fins.

A relatively smooth surfacing movement

Often the back and dorsal fin appear together.

Then the whale disappears beneath the surface before emerging again farther ahead.

When several members of a group are travelling together, you may see dorsal fins appearing one after another across the water.

That repeated sequence is very characteristic of an orca encounter.

What Does a Humpback Whale Look Like?

A humpback whale is immediately a much larger animal.

According to NOAA Fisheries' humpback whale profile, humpbacks can reach around 18 metres and weigh roughly 36 tonnes.

But at sea, you rarely see the whole whale at once.

Instead, identification comes from several features.

A visible blow

A humpback's exhalation may be one of the first signs the crew notices.

In cold winter air, the blow can stand out surprisingly clearly.

A long, dark back

The whale's broad back rolls through the surface.

A relatively small dorsal fin

Compared with the enormous body, the dorsal fin is modest.

That alone makes the silhouette completely different from an orca's tall fin.

Very long pectoral fins

Humpbacks have exceptionally long flippers.

Their scientific genus name, Megaptera, essentially means “large-winged.”

Those pectoral fins can sometimes become visible through the water or during surface activity.

A huge tail

When a humpback makes a deeper dive, it may lift its tail flukes high above the surface.

The pattern on the underside can be distinctive enough for researchers to identify individual whales.

NOAA notes that humpback fluke pigmentation, shape and scars can function almost like a fingerprint for photo-identification.

The Simplest Identification Trick

Imagine you see a dark shape at the surface.

Ask:

Is the dorsal fin the dominant feature?

Probably an orca.

Is the body enormous while the dorsal fin looks surprisingly small?

Much more likely a humpback whale.

Then wait.

If a huge tail rises from the water before the animal disappears, the identification becomes much easier.

Why Are Orcas and Humpbacks Near Tromsø in Winter?

Their presence is strongly connected to one of Northern Norway's most important seasonal ecological events:

the winter concentration of Norwegian spring-spawning herring.

Herring can gather in enormous schools.

That amount of food attracts predators.

Orcas are among them.

Humpbacks can be too.

This is why Tromsø's whale-watching season is not simply about whales “living near Tromsø.”

The whales respond to the distribution of prey.

As herring wintering areas change, the whales can change their movements as well.

That is why Arctic Whale Tours operates a full-day search, rather than travelling to one permanent whale location.

For the ecological background, read Do Orcas and Humpbacks Come to Tromsø Every Winter?.

How Do Orcas Hunt Herring?

This is where orcas become particularly fascinating.

They are not simply fast predators chasing individual fish.

Norwegian orcas are well known for sophisticated herring-feeding techniques.

A group may work together to concentrate fish into a much tighter school.

One famous Norwegian strategy is often called carousel feeding.

In simplified terms, the whales can:

1. Locate a herring school.
2. Work together to contain and concentrate the fish.
3. Push the school toward a more manageable position.
4. Use tail movements to stun or disorient fish.
5. Feed on the affected herring.

It is coordinated behaviour.

That does not mean every orca feeding event you see will look exactly like this.

Orca populations have different feeding cultures, and individuals can adapt their behaviour to the available prey.

NOAA Fisheries explains that killer-whale populations can specialise in different prey and hunting strategies. In Norwegian waters, herring and other schooling fish are especially important, although Northeast Atlantic orcas are also known to exploit other prey.

Orcas Are Social Hunters

Watching several orcas together is not simply watching several independent animals that happen to be in the same place.

Their social relationships matter.

Orcas often live in long-lasting social groups.

Family relationships can shape:

• Travel
• Communication
• Hunting
• Learning
• Care of younger animals

They use:

• Clicks
• Whistles
• Pulsed calls

to communicate and navigate their underwater environment.

And hunting knowledge can be socially learned.

This is why experienced guides do more than point and say:

“There are the whales.”

If you see several orcas spreading out, regrouping and repeatedly changing position around a herring school, you may be watching coordinated behaviour rather than random swimming.

How Does a Humpback Whale Feed?

A humpback uses a completely different system.

It does not have teeth for capturing individual fish.

Instead, it has baleen.

Baleen consists of keratin plates hanging from the upper jaw.

The whale takes a huge volume of fish-filled water into its mouth.

Then it forces the water back out through the baleen.

The fish remain behind.

This allows one feeding movement to capture many small prey animals at once.

A humpback whale is therefore essentially solving the same problem as an orca—

how do I turn thousands of tiny herring into a worthwhile meal?

—but using completely different equipment.

What Does Humpback Feeding Look Like?

One of the most spectacular behaviours is lunge feeding.

A humpback accelerates toward concentrated prey and opens its enormous mouth.

The pleated skin beneath the throat expands.

The whale can temporarily engulf a huge volume of water and fish.

From the boat you may see:

• The head breaking the surface
• The mouth open
• Water pouring around the animal
• Herring scattering
• Seabirds gathering overhead

Humpbacks can also use bubbles and other techniques to help concentrate prey.

NOAA's humpback-whale guide describes several feeding methods involving bubbles, sound and coordinated movements to corral fish.

But again:

Do not expect every humpback encounter to involve spectacular surface feeding.

A whale may simply be:

• Travelling
• Diving
• Searching
• Feeding below the surface
• Resting between activity

Can Orcas and Humpbacks Feed Together?

This is where Northern Norway becomes especially interesting.

Yes, the two species can occur at the same herring feeding event.

But saying they “hunt together” is probably too simplistic.

Research conducted in Northern Norway documented mixed feeding aggregations involving orcas and humpback whales.

In a study based on observations from 2013–2016 in Andfjord, researchers documented humpbacks joining many herring-feeding events that had already been initiated by killer whales.

The observations suggested that the orcas often concentrated the herring first, after which humpbacks arrived and fed from the same prey patch. Read the published Mammalian Biology study.

That is fascinating because it shows how two very different predators can exploit the same food resource.

But it should not be translated into:

“Orcas and humpbacks work together as a hunting team.”

The relationship is more complicated.

The humpbacks may simply benefit from prey that the orcas have already concentrated.

What Might That Look Like from the Boat?

Imagine the crew finds active orcas.

Several fins are visible.

Seabirds begin concentrating above the same area.

The orcas repeatedly surface around a relatively small patch of water.

Then suddenly:

a humpback appears.

Its surfacing movement is completely different.

The dark back rises.

The whale accelerates.

Perhaps the head appears through the surface.

Now two radically different predators are exploiting the same herring concentration.

For someone watching without context, it may simply look chaotic.

For a guide who understands the behaviour, the scene tells a much richer story.

Which Is Bigger: Orca or Humpback Whale?

The humpback—by a huge margin.

Globally, NOAA lists killer whales up to around:

9.8 metres and roughly 10 tonnes

while humpbacks can reach approximately:

18 metres and around 36 tonnes.

But numbers alone do not communicate the difference very well.

Seeing them in the same area does.

An orca can look enormous when it surfaces beside a vessel.

Then a humpback appears nearby and suddenly changes your sense of scale.

The humpback's back alone can seem enormous.

Its pectoral fins can be several metres long.

Its tail can dominate the surface when it dives.

Is an Orca More Dangerous Than a Humpback?

That is not a particularly useful way to think about whale watching.

Orcas are apex predators.

Humpbacks are enormous wild animals.

Both deserve space and responsible vessel behaviour.

The goal is not to decide which animal is “safe” and which is “dangerous.”

The goal is to observe both without disrupting what they are doing.

For guests aboard a properly operated whale-watching vessel, the practical concern is responsible approach and observation.

Why Do Orcas Have Teeth but Humpbacks Have Baleen?

Because they evolved to solve feeding problems in very different ways.

Orca

A toothed whale.

It can capture individual prey and uses sophisticated sensory and hunting behaviour.

Humpback

A baleen whale.

It is adapted to taking large quantities of relatively small prey in a single feeding action.

This difference between toothed whales and baleen whales is one of the most fundamental divisions within modern cetaceans.

And Northern Norway gives you the unusual possibility of observing representatives of both groups using the same winter ecosystem.

Can Orcas Echolocate?

Yes.

Orcas are toothed whales, and echolocation is an important part of how they sense their environment.

They produce clicks and interpret the returning echoes.

This helps them understand:

• Distance
• Objects
• Prey
• Their surroundings

They also use whistles and calls for social communication.

MS Alba carries a hydrophone, which allows the crew to listen underwater when circumstances make it useful.

But a hydrophone should never be treated as a magical whale detector.

Whether useful sounds are heard depends on:

• Animal behaviour
• Distance
• Direction
• Background noise
• Whether the whales are vocalising

Do Humpbacks Echolocate?

Not in the way toothed whales such as orcas and sperm whales do.

Humpbacks produce sounds and use acoustic communication, but they are not considered echolocating cetaceans in the same sense as toothed whales.

This is another fundamental difference between the two species.

Orcas inhabit an acoustic world shaped partly by active echolocation.

Humpbacks use sound extensively but feed primarily through baleen filtration and other sensory systems rather than toothed-whale echolocation.

Are Humpback Whales Always Alone?

No.

But their social organisation differs greatly from that of orcas.

Orca family groups can remain associated for long periods.

Humpbacks generally form more flexible and temporary associations.

During feeding, however, several humpbacks may gather where prey is abundant.

That means seeing several humpbacks together does not automatically mean you are looking at a stable family pod similar to an orca group.

This distinction is important when interpreting what you see.

Can You Tell Individual Orcas Apart?

Researchers can often identify individual orcas using features such as:

• Dorsal-fin shape
• Scars
• Notches
• Saddle-patch pattern
• Body markings

A damaged or unusually shaped dorsal fin may make one animal particularly recognisable.

Adult males can also be visually striking because of their very tall dorsal fins.

Photo-identification allows researchers to follow particular individuals across time and better understand their associations and movements.

Can You Identify Individual Humpbacks?

Yes—and their tails are especially useful.

The underside of a humpback whale's fluke can contain distinctive combinations of:

• Black and white pigmentation
• Scars
• Shape
• Edge patterns

Researchers photograph these flukes and compare them with catalogues.

As NOAA explains in its humpback species profile, these markings can work much like fingerprints.

That means a photograph you take of a humpback tail is not only visually impressive.

It may show an individual whale that researchers have encountered before.

Orca or Humpback: Which One Breaches?

Both can.

But do not build your expectations around it.

Humpbacks are particularly famous for spectacular surface behaviours including:

• Breaching
• Tail slapping
• Pectoral-fin slapping

Orcas may also:

• Breach
• Spy-hop
• Tail slap
• Roll
• Show social surface activity

But any of these behaviours are possibilities, not scheduled performances.

A quiet encounter can be just as biologically interesting.

An orca group moving methodically around a herring school may tell you more about the animals than one random breach.

What Is Spy-Hopping?

Spy-hopping happens when a whale rises vertically or near-vertically and lifts its head above the water.

Orcas are especially well known for this behaviour.

It may allow the animal to inspect what is happening above the surface.

If it happens near the vessel, it can feel almost as if the whale is looking back at you.

But again, it should never be promised.

Why Do Humpbacks Show Their Tails?

A humpback often raises its tail when preparing for a deeper dive.

The body arches.

The tail lifts.

Then the whale disappears.

This can provide one of the best opportunities for photo-identification.

But not every dive produces a dramatic fluke.

Some whales simply sink beneath the surface.

What Does an Orca Encounter Feel Like?

Orca encounters often feel busy.

You might have several animals in different directions.

One fin surfaces.

Then another.

A calf appears beside an adult.

An adult male's towering dorsal fin breaks the water farther away.

The group changes direction.

Several animals disappear.

Then they reappear somewhere unexpected.

If feeding is occurring, there may also be:

• Seabirds
• Rapid movement
• Herring activity
• Repeated direction changes

You often find yourself looking everywhere at once.

What Does a Humpback Encounter Feel Like?

A humpback encounter often has a completely different scale.

First:

the blow.

Then:

the back.

The animal may move slowly through the surface before diving again.

There may be long pauses between surfacings.

Then suddenly, if feeding begins, that calm can turn explosive.

A huge head rises.

The mouth opens.

Water and fish move everywhere.

Or the whale may simply lift an enormous tail and disappear.

The power comes from the animal's sheer size.

Can You See Both on the Same Tromsø Safari?

Yes, it is possible.

The two species may exploit the same broader winter herring system.

Sometimes they may even occur at the same feeding area.

But it is important to use the word:

possible.

Not:

expected.

A departure might find:

• Orcas only
• Humpbacks only
• Both
• Other cetaceans
• No cetaceans at all

Wildlife distribution can change daily.

Which Species Is More Common?

We would avoid turning this into a promise.

Orcas and humpbacks are both important target species during the winter season.

Their relative abundance can change:

• Between seasons
• Within the same season
• Between different areas
• As herring distribution changes

A week with repeated orca encounters does not prove that orcas will remain in the same area next week.

The same is true of humpbacks.

Are Orcas and Humpbacks in Tromsø All Winter?

Again, the important distinction is between Tromsø as the departure city and the larger winter feeding region.

The whales can be some distance north of the city.

Their distribution follows ecological conditions—especially prey—not municipal boundaries.

Arctic Whale Tours therefore operates the Tromsø safari as a full-day expedition.

The current trip normally lasts around 8 hours ±1 hour, depending on weather and whale location.

The current vessel, MS Alba, has a heated lounge, panoramic windows, outdoor viewing areas, toilets and hydrophone.

For exact current operating information, use the Winter Whale Safari page.

How Do Guides Identify a Whale Quickly?

Experience changes what you notice.

A first-time observer may see:

a black shape.

A guide may immediately look at:

• Dorsal-fin shape
• Back profile
• Blow
• Colour
• Surface sequence
• Group size
• Swimming speed
• Direction
• Fluke behaviour

For example:

Tall fin + black-and-white body + several animals travelling together

strongly suggests orcas.

Large blow + enormous rounded back + small dorsal fin + deep fluke dive

strongly suggests a humpback.

Identification often happens before guests can even find the animal through their camera.

A Guide's Best Advice: Watch the Water Before the Whale Appears

Do not only stare at the animal.

Watch what is happening around it.

Ask:

Are seabirds gathering?

Are several fins surrounding the same area?

Is the water unusually disturbed?

Are herring breaking the surface?

Is the whale travelling steadily or repeatedly returning to the same spot?

Those clues can tell you whether you are watching:

• Travel
• Feeding
• Social behaviour
• Searching
• Resting

The species name is only the beginning of the story.

Orca vs Humpback: What Should You Hope to See?

Both.

But not because one is better than the other.

An orca encounter can reveal:

• Social organisation
• Coordinated hunting
• Communication
• Family structure
• Speed and agility

A humpback encounter can reveal:

• The scale of a large baleen whale
• Lunge feeding
• Baleen-based feeding
• Long migrations
• Individual fluke patterns

Seeing both in the same ecosystem makes the experience even more interesting because it shows how two very different animals have arrived at the same ecological opportunity:

winter herring.

And If You See Only One Species?

You have not received half an experience.

This is not a zoo checklist.

A long, natural encounter with one group of orcas can reveal far more than briefly seeing several species.

Likewise, one humpback actively feeding can become the defining moment of the entire trip.

Quality matters more than the number of boxes checked.

What Other Cetaceans Could Appear?

Northern Norwegian waters support other cetacean species as well.

Depending on conditions, possible additional observations can include:

• Fin whales
• Dolphins
• Harbour porpoises
• Other occasional cetaceans

These should be considered possibilities rather than expected components of every safari.

The main winter focus remains:

orcas and humpback whales.

Are Fin Whales Easy to Confuse with Humpbacks?

At a distance, perhaps.

Both are very large baleen whales.

But fin whales have a noticeably different body shape.

They are:

• More streamlined
• Longer-looking
• Faster in appearance
• Characterised by a more prominent falcate dorsal fin relative to the body profile

A humpback tends to look bulkier and more rounded at the surface.

The enormous pectoral fins and characteristic tail also help when visible.

Guides can usually distinguish the species quickly from surfacing behaviour and body profile.

What Time of Year Can You See Orcas and Humpbacks?

The main Arctic Whale Tours winter season runs from November through January.

But there is no honest way to say:

“December is for orcas and January is for humpbacks.”

Wildlife does not divide itself neatly according to our calendar.

The distribution of herring is more important.

For a detailed month-by-month explanation, read Best Time for Whale Watching in Tromsø: November, December or January?.

Can You See Them During the Polar Night?

Yes.

Much of the winter whale season overlaps the Polar Night.

That does not mean the safari operates in complete darkness.

Around the middle of the day, Arctic twilight gives several hours of usable natural light.

A black orca dorsal fin against pale winter water can be remarkably easy to notice.

A humpback's blow can stand out against snowy mountains.

For the complete explanation of Tromsø's winter light, read Whale Watching During the Polar Night in Tromsø.

Which Is Easier to Photograph?

It depends on behaviour.

Orcas

Can be challenging because they may:

• Move quickly
• Change direction
• Surface briefly
• Appear in several places

But their contrasting colouring and tall dorsal fins can make them visually distinctive.

Humpbacks

May provide:

• Larger visual targets
• More obvious blows
• Longer visible backs
• Predictable-looking dive sequences

But low winter light remains challenging for both.

The best photographic subject is ultimately the whale that gives you enough time to observe its behaviour.

Responsible Watching Matters for Both Species

Orcas and humpbacks are wild animals engaged in important winter behaviours.

Feeding in particular matters.

A vessel should not interrupt:

• Hunting
• Feeding
• Travel
• Social interactions
• Resting

Responsible whale watching means observing behaviour first and adapting the vessel accordingly.

The objective is not:

How close can we get?

The better question is:

Can we observe without changing what the animals were already doing?

This is especially important when several vessels are present around the same animals.

Why Herring Makes the Whole Story Possible

An easy mistake is to think of winter whale watching as primarily about:

orcas

or

humpbacks.

Ecologically, the story begins one level lower.

With fish.

The herring concentrations bring energy into one place.

Then predators respond.

Orcas arrive.

Humpbacks arrive.

Seabirds gather.

Other predators may take advantage of the same system.

This is why winter whale watching is much more interesting when you understand the food web, rather than treating individual whales as isolated attractions.

Two Predators, One Arctic Opportunity

An orca and a humpback could hardly look more different.

One is a highly social toothed predator from the dolphin family.

The other is an enormous filter-feeding baleen whale.

One can use coordinated hunting and echolocation.

The other can engulf huge volumes of herring-filled water.

Yet in Northern Norway in winter, both can respond to the same ecological opportunity.

Herring.

That is why a winter safari can change so quickly.

You might begin by following a group of orcas.

Several dorsal fins move through the water.

The whales begin concentrating around one area.

Seabirds arrive.

Then a completely different shape breaks the surface.

A huge blow.

A broad back.

A humpback whale.

For a few minutes, you can watch two very different evolutionary solutions to the same problem:

how to make a living from the Arctic sea.

And that is much more interesting than simply asking which whale is better.

Plan Your Tromsø Whale Safari

If you join a winter whale safari from Tromsø, remember:

Orcas and humpbacks are the two main target species.

Neither is guaranteed.

They may occur separately or in the same wider feeding area.

Orcas are toothed dolphins and highly social predators.

Humpbacks are enormous baleen whales adapted for bulk feeding.

Their winter presence is closely connected to herring.

And when you see one:

Try not to reach for your camera immediately.

Watch the animal first.

Notice the dorsal fin.

The blow.

The other whales around it.

The birds.

The water.

Ask yourself:

What is this animal actually doing?

Once you begin seeing behaviour rather than simply species, whale watching becomes a completely different experience.

Continue Learning About Tromsø's Winter Whales

Start with Do Orcas and Humpbacks Come to Tromsø Every Winter?.

Planning your dates? Read Best Time for Whale Watching in Tromsø.

Visiting during December? Read Whale Watching During the Polar Night in Tromsø.

For the complete practical experience, read What to Expect on a Winter Whale Safari in Tromsø.

Or check current dates and availability for the Winter Whale Safari from Tromsø.

Frequently Asked Questions

Are orcas actually whales?

Orcas are cetaceans but belong to the dolphin family, Delphinidae. They are the largest members of the dolphin family.

Which is bigger, an orca or a humpback whale?

A humpback is considerably larger. The largest orcas can approach 10 metres, while humpback whales can reach around 18 metres.

How can I tell an orca from a humpback?

Look at the dorsal fin and body profile. Orcas have distinctive black-and-white colouring and a prominent dorsal fin. Humpbacks have a huge dark back, relatively small dorsal fin, visible blow and often show their large tail before a deeper dive.

Can you see orcas and humpbacks together in Norway?

Yes. Both species can exploit the same herring feeding areas, and scientific research in Northern Norway has documented mixed-species feeding aggregations.

Do orcas and humpbacks hunt together?

It is more accurate to say they can feed at the same prey patch. Research in Northern Norway has observed humpbacks joining herring feeding events initiated by killer whales, but this should not simply be described as the two species cooperatively hunting together.

What do Norwegian orcas eat?

Herring and other schooling fish are particularly important for Norwegian orcas, although Northeast Atlantic killer whales can have broader diets.

What do humpback whales eat in Northern Norway?

During winter feeding opportunities, humpbacks can exploit schooling fish such as herring. Humpbacks are baleen whales and filter prey from large volumes of seawater.

Do humpback whales have teeth?

No. They have baleen plates instead of teeth.

Can orcas echolocate?

Yes. Orcas are toothed whales and use echolocation as well as clicks, whistles and calls.

Do humpback whales echolocate?

Not in the same way as toothed whales such as orcas. Humpbacks produce and use sound extensively but are not considered echolocating whales in the same sense.

Can you see orcas in Tromsø every day?

No. Orcas are wild animals whose movements depend strongly on prey and other environmental conditions. No particular whale species can be guaranteed.

Can you see humpbacks every day?

No. Humpback sightings also vary with whale distribution, prey and conditions.

Which is better to see: orcas or humpback whales?

They offer very different encounters. Orcas provide insight into social organisation and coordinated predation, while humpbacks demonstrate the enormous scale and feeding adaptations of baleen whales. A natural encounter with either species can be exceptional.

‍