About a century ago on the south coast of New South Wales, A patriarch Orca named Old Tom teamed his pod up with human whalers to decimate the local baleen whale population.

He co-operated with 3 generations of a human whaling family before he died a natural death.

His skeleton remains on display in the local museum to this day.

https://en.wikipedia.org/wiki/Old_Tom_(killer_whale)

edit: longer story about him;

https://blogs.scientificamerican.com/running-ponies/the-lege...