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Caption
Adult males Kato and Nick are traveling along a trail. Kato is 20 m ahead of Nick. Kato startles upon seeing the snake, which is placed at the edge of the trail, and then produces a series of alert hoos. He then turns to look back at Nick, producing louder alert hoos as he turns. Nick, the alpha male, now some 10 m behind, has stopped traveling. With the louder alert hoos, Nick sits without approaching further. Later, Nick makes a detour, traveling off the road through the forest before returning to the road again after passing the position of the snake model. Nick never actually sees the snake.
Credit
<I>Current Biology</I>, Crockford et al.: "Wild chimpanzees inform ignorant group members of danger."
Usage Restrictions
Videos are under embargo until Thursday, Dec 29th at 12 Noon ET.