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Last May, a team led by Joanna Dally of the University of Cambridge reported that scrub jays could remember which other birds were watching them when they first hid some treats, and change the hiding places if there was a chance the other birds could steal the food.

Jays are members of a group of birds called corvids, which include crows, jays and ravens. Biologists consider them to be the most intelligent birds.

Also last May, Nicholas Mulcahy and Josep Call of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, tested bonobos, close relatives of chimpanzees, and orangutans at the local zoo and found the animals could plan and use tools.