Scientists made a little test for a rook. They put in front of him a glass tube with a little basket inside filled with worms. Of course, it�s impossible to extract them with his beak. But the bird found a way to get them out of there. Look how.
What you see on this photo is the bird using the edge of jar to bend one end of the straight wire into a hook shape.
What you see on this photo is the bird using the edge of jar to bend one end of the straight wire into a hook shape.
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