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10 animals that learn through play

By: Meredith Darlington on March 28, 2011, 3:48 p.m.
Grizzly bears

Photo: BBC Earth

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Grizzly bear

From afar, play-fighting bears can look like they are having a serious confrontation, but the best way to tell is to look at the hairs around the neck and shoulders. If the hair lies flat, then it’s harmless fun. However, if the hair is erect, then that’s the signal to move well away.