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作者:朱厘飓    发布时间:2019-03-07 08:06:11    

COYOTES are a bird’s best friend, according to ecologists who have studied how the animals keep smaller predators such as cats in check. Kevin Crooks of the University of California at Santa Cruz and Michael Soulé of The Wildlife Project in Hotchkiss, Colorado, surveyed enclaves of land around San Diego. Areas visited by coyotes had fewer small predators, such as raccoons, skunks and cats, but more native birds. Elsewhere, small predators were more common and birds were rarer (Nature, vol 400, p 563). “The absence of the large predator releases the smaller ones to become both more active and more numerous,

 

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