Ground squirrels have devised a highly effective alarm system to defend themselves from such predators as the hawk, coyote and bob cat. However this is no match for their worst enemy, the rattlesnake, which winds it way through an intricate system of tunnels to the squirrels nests.
Director: Marco Visalberghi
Photography: Maurizio Felli
Production: Paneikon - RAITRE - National Geographic - WDR Köln
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