Humpbacks fight off orcas to save sea lion in maritime battle royale

Was it the law of the jungle, the golden rule or just some newcomers defending their turf?

Some whale watchers are still trying to make sense of an unusual encounter off the southern tip of Vancouver Island that might just rewrite our understanding of interspecies behaviour.

“This was an example of humpback whales coming to the rescue of another marine mammal, in this case a Steller sea lion,” said Michael Harris, the head of the Washington-based Pacific Whale Watch Association.

“We knew there would be some encounters, but we never expected to see something like this. It was an amazing, amazing encounter.”

According to Harris, the incident began when a group of four Bigg’s Killer Whales started hunting a lone Steller sea lion in the waters off Sooke on Sept 11.

“As the hunt was going on, two humpbacks decided to intervene and actually get between the sea lion and the killer whales,” said Harris.

“Then, two more humpbacks joined the fray, literally putting their huge bodies between the orcas and the sea lion, flipping their flukes on the water, trumpeting very, very loud at these transient orcas and ultimately saving this sea lion and escorting it in the other direction of these killer whales.”

Humpbacks v. Bigg's killer whales v. Steller sea lion!  Humpback

The attack was launched by four Bigg’s killer whales, previously known as transients, whose diet is composed largely of marine mammals. (Alethea Leddy/ Port Angeles Whale Watch)

‘The water boiled all around’

Naturalist Alethea Leddy with the Port Angeles Whale Watch Company was one of the first on the scene and watched the whole encounter unfold.

“The water boiled all around as the orcas tried to separate the sea lion from the humpbacks,” she recalled.

“It was a wild scene with the humpbacks even circling the sea lion trying to keep him safe, while he frantically struggled to get his breath. The anxiety of the humpbacks was palpable, and they took turns diving and slashing at the orcas.

Veteran Capt. Russ Nicks of B.C. Whale Tours of Victoria also saw the attack — and the defence.

“What we witnessed was pure aggression,” Nicks remembereds. “We had four humpbacks trumpeting, rolling on their sides, flukes up in the air multiple times.”

“The killer whales split many times into two groups, with one that appeared to try to draw the humpbacks away from the sea lion. The other group would go in for the attack, while the humpbacks were safely away — but then they’d get in the middle of it again, fighting the orcasoff.  It was amazing to watch.”

Eventually, the humpbacks appeared to win the battle with both sides going their separate ways, including the sea lion who stuck with the humpbacks until it was safely out of sight from the hungry killer whales.

“I think the Stellar sea lion was well aware that he had some help out there, and he was lucky he did, because he would have been lunch,” said Harris.

Humpbacks v. Bigg's killer whales v. Steller sea lion!  Humpback

The sea boiled as the three sides battled for position, according to witnesses. ( Alethea Leddy/Port Angeles Whale Watch)

Anthropomorphic interpretation?

Harris says this is the first time he’s heard of this sort of behaviour by whales in the Salish Sea, but it’s actually been reported elsewhere recently.

“A publication came out last month from researchers who were saying they were witnessing humpback whales coming to the rescue of smaller marine mammals and saving them from transient orcas, but we had never seen anything like that in the inland sea.”

According to researchers, most of the time when humpback whales do battle with killer whales, they appear to be acting in an apparently altruistic way to save other marine mammals from the transient predators.

“Nine times out of 10, they are actually intervening to save another species,” said Harris, who admits when he first heard about the research, he was skeptical the researchers were over-interpreting the animals’ behaviour.

“Someone asked me about it, and I said, ‘I’m not so sure about it. I think we would need to see something like that happen. That seems pretty anthropomorphic, like us human beings imparting our own value sets on these creatures out there.'”

“But now we have seen it first-hand, and I am a believer,” he freely admitted.


Full story: British Colombia

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