英语听力：自然百科 野性俄罗斯之西伯利亚 Siberia—14

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Come evening, a cool mist hangs over the lake, as the last of the egg-laying caddis flies get picked off by ducks and bears.

 

Brown bears are crepuscular¹, preferring to venture out at dawn or dusk. They have a fantastic sense of smell, and can track the scent² of the carcass for over three kilometers. But they are not alone in that respect. Two predators³ are after the same prize, but there is no way a fifty-kilogram wolf will challenge a 500-kilogram bear. Getting in first, the weaker wolf steals what it can, a large leg bone, but stopping to watch its back is a mistake.

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