Scientists Sakumi Iki and Ikuma Adachi recently spent a lot of time watching monkeys scratch themselves. Self-scratching among non-human primates is known to indicate social tension and anxiety.

There are more than 16 New World monkey species, including gracile capuchin, owl, howler, and saddle-back tamarin. As you would expect, Old World monkeys live in what is referred to as the ‘Old World, ...

Mar. 12, 2025 — We're all familiar with Pavlovian conditioning, in which a reward-anticipatory behavior follows a reward-predicting stimulus. Perhaps you experience it yourself when passing a ...

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Meet Cairo! He's a 16-month-old mountain lion at the Louisiana Purchase Gardens and Zoo in Monroe.

CNN International ...