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From Today's New York Times

Animal Ethics

To the Editor: Re β€œ Monkeys Think, Moving Artificial Arm as Own ” (front page, May 29): The brain really is a fascinating organ. I was also intrigued to read that β€œin previous studies, researchers showed that humans who had been paralyzed for years could learn to control a cursor on a computer screen with their brain waves.”

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How much bird is there, anyway?

10,000 Birds

Here’s some data from the famous research project of Manu, Peru, giving biomass in kilograms per hectare. A single large spider monkey, which might be out of view, equals a large number of lightly built and small birds which may be scattered across the landscape. Tropical Forest Ecology: a view from Barro Colorado Island.

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