The owls can raise anything from 1 to 12 chicks in a summer season. To survive, their young will hav ...

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And farming fuelled the growth of another habitat, one that would become an even bigger challenge to ...

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Where purple martins had once laid their eggs in hollow threes, in time, they came to rely almost to ...

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To find the answers, we need to rewind history around 14,000 years to a time when the first people s ...

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Though very powerful, she's not a sprinter and she needs to get close to her prey before she strikes ...

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At first, the Europeans relied heavily on local food supply by native people. But as they settled in ...

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But even on its own, a mammoth was still highly dangerous and an attack required stealth and teamwor ...

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By the mid 1800s, the horse and the cowboy had come to symbolize the wild west. And of course, with ...

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and may trace their ancestry all the way back to the first dogs to enter North America. The Carolina ...

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Just over 500 years ago, Europeans arrived in North America. And with these colonizers came an anima ...

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Downtown L.A., the ultimate modern American city, but Los Angeles skyscrapers are built over the gra ...

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Saber-tooth died out, but another big cat survived. 剑齿虎灭绝了，但是另一种大型猫科动物幸存了下来。 ...

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In the heat of the day, hunters can afford to slow down and rest in the shade. It's one of the advan ...

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But there is a problem with the idea that hunting caused the mass extinction. Mammoths were not the ...

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The same signs appear in young male mammoth tusks, but those living in North America at the end of I ...

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My gosh.Hi,everybody.You look,you're on fire today.天呐 大家好 你今天太帅了I wonder why.You were not ...

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Conan,a guy in a headset is telling me to say my line.柯南 一个戴耳机的家伙让我说台词Ok,I can't help ...

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We got great television tonight.This is an exciting night for television.今晚节目很棒 今晚是电视的大 ...

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I got an award for that joke.Put it right over here in my mind.我靠这段子获奖了 就放在我脑子里Crazy ...

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You got energy.Yeah,man,come on.You got energy and pep of a young man.me?I'm like an old man.你真有 ...

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