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How Orca Cannibalism Might Have Solved a Decades Long Mystery

KPassionate

775,663 views

A rare case of orca cannibalism might have answered one of the oldest and most puzzling mysteries about orca behavior. A mystery that has stumped marine biologists for decades.

00:00 - 01:49 Orca Cannibalism
01:49 - 02:56 Antarctic Orcas
02:56 - 05:31 Orcas of the Pacific Northwest
05:31 - 07:47 Bigg’s Orcas VS Resident Killer Whales
07:47 - 09:53 Do Orcas Stay With Their Moms For Life?
09:53 - 11:10 Whale Gang Wars
11:10 - 12:28 Type B1 Orcas

For a long time, marine biologists focused on why the Bigg’s orcas lived in small, fluid groups. It was originally believed to be due to the killer whales diet of marine mammals. This requires the orcas to hunt in silent, coordinated attacks and smaller party sizes reduces the likelihood of getting caught. The discovery of the severed dorsal fins and evidence of cannibalism has some researchers questioning this approach. Maybe instead of wondering why the Bigg’s orcas travel in small pods, the question we should have been asking is why do the Resident orcas stay with their mom’s for life? Especially since “resident killer whales exhibit a unique social system unlike that of any other mammal.”

Resident orca pod structure doesn’t have anything to do with their preferred prey. Resident killer whales don’t hunt cooperatively. They hunt individually. There are also significant drawbacks to having offspring stay with their mothers for their entire lives. But there is one major advantage to living in a large group of close relatives. Animals are more likely to defend their relatives, especially their offspring. “High relatedness within these groups likely promotes mutual defense, with individuals more inclined to protect one another due to kin selection.”

If Bigg’s killer whales occasionally prey on resident orcas, or if they preyed on them in their evolutionary past, then an anti-predator defense could explain why the resident orcas evolved such a unique social structure. Bigg’s preying on resident killer whales could also explain why the residents have been observed initiating the aggressive interactions. This is known as mobbing behavior and it’s common throughout the animal kingdom, especially in birds.

Southern Resident Killer Whale Mother With New Calf
Sea Doc Society, San Diego Zoo Wildlife Alliance, and NOAA Fisheries
Taken under permit 21348

Photogrammetry research on Southern Resident Orcas
NOAA Fisheries & Vancouver Aquarium
Taken under DFO research permit MML18 and Transport Canada flight authorization

DTAG research on Southern Resident Killer Whale
NOAA Fisheries taken under NMFS ESA/MMPA Permit 16163

Southern Resident Orca J50 Feeding Trials
Filmed under NMFS research permit 18786

Winter 2015 Orca Research
NOAA Fisheries Filmed under NMFS ESA/MMPA Permit 16163

Southern Resident Orca J50 Antibiotic Injection Preparation
NOAA Fisheries Filmed under NMFS research permit 21368

Sources
[1] https://www.instagram.com/p/CT-3vsEPh...
[2] https://eaglewingtours.com/articles/c...
[3] https://www.knkx.org/environment/2021...
[4] https://phys.org/news/2026-03-killer-...
[5] http://whitelab.biology.dal.ca/rwb/kw...
[6] https://www.researchgate.net/publicat...
[7] https://sites.warnercnr.colostate.edu...
[10] https://onlinelibrary.wiley.com/doi/a...
[11] https://waves-vagues.dfo-mpo.gc.ca/li...
[12] https://www.researchgate.net/publicat...
[13] https://onlinelibrary.wiley.com/doi/1...
[14] https://www.icelandic-orcas.com/post/...

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#kpassionate #orca #killerwhale

20 Comments

@KPassionate Creator 5 months ago Pinned

Learn more about some of the topics I touched on in this video!
Orca ecotypes → https://youtu.be/TnJVE2oNJH0
Old Thom, the orca who lives with white-sided dolphins → https://youtu.be/L0UhICOMPTY
The orcas sinking boats → https://youtu.be/C0cGdd9lUgY
The orcas who eat shark livers → https://youtu.be/ws4cDKU-a-o

@iksarguards 5 months ago

Having to share territory with a subspecies of silent cannibals who are almost constantly eavesdropping on your family is a plot for a horror movie.

@bobrichardson7174 5 months ago (edited)

I got my Masters in Zoology in 1977, and the sheer amount knowledge we've gained since then in cetacean biology and behavior leaves me in the dust.

@paolopasaol9700 5 months ago

Orcannibals in the Big '26 wasn't on my bingo card, but here we are.

2026/04/05 1538

@LuminousSpoon 5 months ago

In a world of falsely generated media, your dworca blooper made my night!

@MykeDiemart 5 months ago

Clicked for whale info and stayed for D&D bookshelf.

@auerstadt06 5 months ago

Orca: "Hey, that orca is different from us -- should we kill him?" "No, let's be nice to him." "Oh, shut up."

@Wailpuh 5 months ago

In other words, the Orca ended up in the wrong neighborhood. Homie got caught lacking by his ops.

@whitebelt4life 5 months ago

Who ever imagined it's like the Wild West for Orcas. Residents are townfolks and Biggs are bandits and outlaws.

@Nordic_Crusader 5 months ago (edited)

I’m Norwegian and I’ve seen a lot of Orcas out in the Norwegian sea. I believe they are different species too, because these animals are extremely intelligent, and the thought that orcas of the same species/subspecies would eat each other are really scary…. But not unheard of in the animal kingdom… damn even human beings have been eating each other.

@russmartin4189 5 months ago

I watched this and thought. Wow. An actual scientist who knows truths about amimals, not AI, nonsense, or made up content to get clicks. I then clicked on your home page. If it was all Orcas all the time, I wasn't going to subscribe, but you have a pretty good variety, beside Orcas, so I joined your following. Hope you make a couple of bucks from my subscription and clicks. Serious people deserve more money. By the way, I have three degrees in non science disciplines, but all through school and beginning collge I was into science. I started college as a chem major. Then I was told I would have to take three calculus courses and have a physics minor, which no doubt would mostly be atomic, and I said "i'm out of here". I then switched to art to take fine art photography, which was my passion, and I lived happily ever after. I'm 77, but still curious.

@faithcrisis2138 5 months ago

Kinda reminds me how a house cat can easily be prey for lynx or cougars

@Savagegarf 5 months ago

So resident killer whales plan is to be more psycho than their psycho neighbors to stay safe.

@marcfitzhenry7581 5 months ago

When she ended with the point that it wasn't cannibalism because they were technically different species i hit subscribe.

@bunnyofdoom4501 5 months ago

New survival horror game: Resident Orca!!! 🧟

@ryanwilson5834 5 months ago

I have two very important questions:
1. Have we found the dworcas' mountain strongholds so they can be observed mining in their natural habitat?
2. Do we know if the dworcas keep a Book of Grudges or do they just delve too greedily and too deep?

@Crakinator 5 months ago

They’re undergoing speciation as we speak, amazing stuff

@irishamerican4558 5 months ago

They were having "Surf Wars".

@kpklz 5 months ago

"and rolled initiative" went hard af 😂

@LoganJohnson-lm2bh 5 months ago

In70's i had an encounter with a pod of Killer whales in the Puget sound off Whidbey Island A young one came to my boat and rose up to look at me I reached out and touched it it just let me with no issue and hung around my 16 foot boat a short time later another showed up a full grown up one and did the same thing soon i was surrounded by 5 of them and they all did the same thing . Just showed up and let me touch then like they were saying hi this lasted for almost an hour .not once did they bump the boat ,just came up beside me and let me reach out and touch them .I think it was a thank you for this reason other boaters were forcing them to come into very shallow water and i had chased those boaters off . it is a day i will never forget .