What eats humpback whales?

Killer whales (orcas) are the only regular predators of humpback whales, and they go almost entirely after calves. A NOAA-hosted review of 115 encounters found that mammal-eating orcas “targeted only calves” when they attacked humpbacks. Large sharks very rarely kill a weak or tangled young humpback. Healthy adults have almost no natural enemies.

An adult humpback is up to about 18 m (60 ft) long and weighs up to about 36 tonnes (40 tons), says NOAA Fisheries. Few animals would take on something that size. A newborn calf is much smaller, at about 4–5 m (13–16 ft), and that is where the danger lies.

What eats humpback whales?

Predators of humpback whales

Predator	Who it targets	How often	Evidence
Killer whale (orca)	Calves, mostly in their first year	Regular; up to about 1 in 4 humpbacks in some regions carry orca tooth scars	Steiger et al. 2008; Pitman et al. 2017
White shark	Weak or entangled young whales	Very rare; first documented kill of a live humpback reported from South Africa in 2017	Dines & Gennari, reported by GREMM
Sharks (scavenging)	Whales that are already dead	Common when a carcass is available	Scavenging, not predation
Humans	All ages	Commercial whaling cut most populations by more than 95% before it ended in 1985	NOAA Fisheries

Today, human activity is the main cause of humpback deaths that scientists can identify. Fishing gear and ship strikes are the biggest threats, which we cover below.

Do orcas eat humpback whales?

Yes, but mainly calves. Only certain groups of killer whales hunt mammals. Others eat fish and ignore whales completely.

Scientists learn about attacks from scars. Orca teeth leave parallel lines called rake marks on a whale’s tail and flippers. A 2008 study in Endangered Species Research, led by Gretchen Steiger, checked 3,650 photos of humpback tails from 16 areas of the North Pacific. It found rake marks on 26% of whales photographed off Mexico. The figure was 20% off California and 6 to 14% elsewhere.

The study concluded that most attacks happen to calves, at or near their winter breeding grounds. Many scarred whales survived and grew up, so a rake mark is often a sign of an escape, not a kill.

How do orcas attack a humpback calf?

Mammal-eating orcas hunt in family groups called pods. They try to separate a calf from its mother, then tire it out and hold it under water so it can’t breathe. The mother often places herself between the orcas and her calf.

Attacks tend to happen when calves are young and making their first long migration. At that point a calf is small, slow and still learning to dive.

Do sharks eat humpback whales?

Almost never while the whale is alive. Sharks, including tiger sharks and white sharks, often feed on dead whales. That is scavenging, not hunting.

A rare kill of a live humpback was seen off Mossel Bay, South Africa, in February 2017. Researchers Sasha Dines and Enrico Gennari described it in a scientific paper, as reported by the whale research group GREMM. The whale was a young humpback about 7 m (23 ft) long, alone and tangled in fishing line. Two white sharks over 3.5 m (11.5 ft) bit it four times in 90 minutes until it sank. The researchers said this was exceptional and probably happened because the whale was already in a “critical state”.

How do humpback whales defend themselves?

Humpbacks don’t have teeth, so they rely on size, their tails and their long flippers. A humpback’s tail flukes can be up to 5.5 m (18 ft) wide, says NOAA Fisheries. A mother can swing them hard at attacking orcas. Their flippers, the longest of any whale, can be up to a third of their body length and are covered in sharp barnacles.

Humpbacks also help each other, and sometimes other animals. A 2017 review in Marine Mammal Science by Robert Pitman and colleagues looked at 115 encounters between humpbacks and killer whales. The review is hosted in the NOAA library. Humpbacks started 57% of the encounters, often by charging at orcas that were already attacking something.

Only 11% of the animals being attacked in these cases were humpbacks. The rest were seals, sea lions, other whales and even a fish. Sometimes the humpbacks’ mobbing let the prey escape. Scientists aren’t sure why humpbacks do this, but one idea is that chasing away orcas protects their own calves in the long run.

What is the biggest threat to humpback whales?

People, by a long way. NOAA Fisheries lists the main threats as:

• getting tangled in fishing gear and marine debris;
• being hit by ships;
• being disturbed by boats;
• ocean noise;
• changing ocean conditions that affect their food.

Whaling was far worse. NOAA says that before a final halt to commercial whaling in 1985, most humpback populations had been cut by more than 95%. Since then, many have bounced back. The IUCN moved the humpback from Vulnerable to Least Concern in 2008, though some subpopulations remain Endangered.

In the US, four of the 14 humpback populations are still listed as endangered under the Endangered Species Act, and one as threatened. The endangered ones live off Central America, in the western North Pacific, in the Arabian Sea and around Cape Verde and northwest Africa.

How long do humpback whales live?

A humpback that survives its first year can live a very long time. NOAA estimates their lifespan at about 80 to 90 years. Females usually have one calf every 2 to 3 years, and calves stay with their mothers for up to a year.

That slow breeding is why the first year matters so much. Every calf that makes it past the orcas has decades of life ahead.

Want to compare? See how big a blue whale is, or read about great white shark adaptations. For another top predator’s list of enemies, try what eats polar bears.

Frequently asked questions

Sources

1. NOAA Fisheries. Humpback whale (Megaptera novaeangliae) species profile.
2. Cascadia Research Collective (2008). Geographic variation in killer whale attacks on humpback whales in the North Pacific: implications for predation pressure (Steiger et al.), Endangered Species Research 4: 247–256.
3. NOAA Institutional Repository (2017). Humpback whales interfering when mammal-eating killer whales attack other species: mobbing behavior and interspecific altruism? (Pitman et al.), Marine Mammal Science 33(1): 7–58, DOI 10.1111/mms.12343.
4. Baleines en direct (GREMM, Group for Research and Education on Marine Mammals). Humpback whale attacked by great white sharks.
5. IUCN (2008). Humpback whale on road to recovery, reveals IUCN Red List.

Sources checked 15 September 2026.