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telesilla
on Jan 10, 2020
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African grey parrots spontaneously 'lend a wing'
Killer whales were recorded by whalers as directing larger whales towards the killing area in return for feeding rights on the dead whales.
https://en.wikipedia.org/wiki/Old_Tom_(killer_whale)
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Search:
https://en.wikipedia.org/wiki/Old_Tom_(killer_whale)