It affected the young animal's front legs, which became hyperextended.

这种疾病影响了幼崽前肢，使前肢腕关节过度伸展。

All birds have two legs and two arms; but these arms are not like ours.

所有鸟儿，都有两个后肢，两个前肢。但是鸟儿前肢， 跟我们人类不一样。

The first was its trio of claws extending from each hand.

第一件就是每个前肢伸出三个爪子。

Whereas with pterosaurs, with this strategy, you're focusing it into one area and really use it both ways.

所以，翼行只会使用到前肢。

Eventually, their front limbs became flippers and their hind limbs became weak and unnecessary.

最终，它们前肢变成了鳍状肢，而它们后肢变得虚和多余。

And they were almost right. Longer front legs and larger toe pads indeed helped.

他们想法基本上是对。前肢更长、趾垫更大确实有助。

We call them wings, and the birds use them for flying.

我们管鸟儿前肢叫" 翅膀" ，鸟儿就是用翅膀来翔。

Its small arms are useless in the water, leaving it to rely on its two powerful legs.

它短小前肢在水中没有用，只能靠两条有力后腿。

Its powerful arm muscles are composed of 80% fast-twitch fiber, a third more than humans.

它强壮前肢肌肉中百分之八十是快缩肌纤维，比人类多三分之一。

Technically, two-toed sloths should be really called two-fingered sloths because the difference is only their front limbs.

从技术上讲，二趾树懒应该被称为二指树懒，因为它们区别只是前肢。

Well, the arms are kind of small.

它前肢确很小。

What you can see is that large toe pads and strong front legs give some lizards a tighter grip.

你可以看到是，大护趾和强壮前肢使一些蜥蜴抓握更牢。

Led by his super sensitive nose, his long limbs carry him many miles a day in search of carrion.

凭借极度敏感嗅觉和长长前肢，短面熊为了寻找腐肉能一天行进数英里。

The shape of the creature's hands and forelimbs suggest it was a skillful and powerful digger, scientists say.

科学家说，这种生物手和前肢形状表明它是一种熟练而有力挖掘者。

She has long, strong front legs to help her climb around for food 20 metres up in the canopy.

它前肢又长又有力，可以助它在 20 米高树冠上四处攀爬觅食。

As he rips back, he rips an enormous chunk of flesh from the underside of the arm.

它往后拽时，从其前肢下侧拽下来相当大一块肉。

Although the arms of Albertosaurus were small compared to its overall body size, they were still packed in muscle.

尽管阿尔伯特前肢与体型相比很小，它们也有发达肌肉。

It had, relative to size also comparing with T-Rex, its arm appeared larger.

它前肢按与身体比例来说比霸王要大。

Utahraptor will usually grasp its prey with its arms and use its leg claws to slash at its victim.

犹他盗通常会用前肢抓住猎物，然后用它脚爪划割猎物。

You see, it is hard for bears to run down hill, because their hind legs are longer than their front ones.

你知道，熊很难跑下山，因为它们后肢比前肢长得多。