This interesting study showed that Rooks (a kind of crow), can create and modify tools and "have a sophisticated intelligence to rival that of chimpanzees".
"They were presented with a small bucket of wriggling worms out of reach at the end of a tube, and next to it a piece of straight wire.
Remarkably, despite never having seen the set-up before, they immediately got to work bending the wire so they could hook out the bucket and tuck in."
Read the full article with photos.
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