There is a long history of organisms evolving to look similar to toxic/poisonous organisms. For example, there are a plentiful number of butterflies that resemble the very toxic monarch butterfly.
But this is a new one for me: Chicks of the cinereous mourner has plumage that looks exactly like the caterpillar. It even moves the way the caterpillar moves! Check out this article over at National Geographic.
Or just watch this cute little caterpillar:
And the bird that wants to look just like them: