The organized collective work is reflected on the enclosure wall that protected the village.

UNESCO: Choirokoitia

The idea was to see whether the rook would wait for the other rook to enter the enclosure so they could once again work together to reach the food.

BBC: Rooks team up to solve problems

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ENGADGET: Hitachi GST's G-Drive Slim: world's thinnest 2.5-inch external hard drive