因为树懒的体型比棕熊和北极熊要小，而且面临着更大的来自危险动物的威胁，所以它们可能会带着幼仔采取额外的预防措施。
Because sloth bears are smaller than brown and polar bears and are under greater threat from dangerous animals, they may have adopted the extra precaution of carrying their cubs.
除非有足够的雄性来繁衍新生代，否则长久以往，动物的数目将面临真正的威胁。
Unless enough males contribute to the next generation there is a real threat to animal populations in the long term.
虽然长江豚的灭绝主要是因为水源污染，但对海洋哺乳动物来说，面临的最大威胁是深陷鱼网或被渔船捕获。
The greatest threats to Marine mammals are being caught in fishing nets or being struck by shipping vessels, although for the Yangtze river dolphin, pollution is a major contributor.
最近一份报告显示，世界634个灵长目动物物种中，48%面临灭绝的威胁，被自然保护者国际组织列为红色警告。
A recent report showed that, of the world's 634 primate species, 48% are classified as threatened with extinction on the International Union for the Conservation of Nature's "red list".
Nicklen作为一位美国国家地理杂志卓有贡献的摄影师，正向我们传递来自两极动物的讯息：它们的生存面临威胁。
And Nicklen, a contributing photographer for the National Geographic, is passing along a message from the creatures he sees in the Arctic and Antarctica: They're in trouble.
还有一点需要指出的是，目前对动物进行的克隆已产生形体异常硕大的后代。这意味着母亲和任何潜在的胚胎的健康都将面临严重的威胁。
Abnormally large progeny have resulted in animal cloning done to date, which suggests that there are serious risks to the health of the mother and any potential embryo.
但研究人员说，这种城市两栖动物面临着诸如农药和传染病的威胁，更别说现实版青蛙过河游戏中的种种危险了。
But the researchers say that the urban amphibians face threats like pesticides and infectious diseases. Not to mention real-life games of Frogger.
当一个毛绒动物面临突如其来的危险，“食肉动物”侦察机为例，它可以使自己看起来更威胁了它的皮毛以说明。
When a furry animal is confronted with sudden danger, a predator for example, it can make itself look more menacing by puffing up it's fur.
在自然界中，动物所面临的生存威胁主要来自于捕食者和寄生生物。
In particular, the large and rich colonies of honeybees are a very rewarding target for a great variety of predators and parasites.
先是动物熬不住，现在连他们的孩子也面临着死亡的威胁。面对逐步上升的死亡数字，许多人担心村庄的生活将迅速走向尽头。
First their animals and now their children are dying and in such 9 escalating Numbers that many fear life in the village may be rapidly approaching an end.
先是动物熬不住，现在连他们的孩子也面临着死亡的威胁。面对逐步上升的死亡数字，许多人担心村庄的生活将迅速走向尽头。
First their animals and now their children are dying and in such 9 escalating Numbers that many fear life in the village may be rapidly approaching an end.
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