"The thing is, whales do not have hair, fur or feathers that could offer some protection, and they are forced to surface in order to breathe," co-author Karina Acevedo-Whitehouse told Discovery News.
“问题是，鲸鱼没有用以保护的毛发、毛皮或羽毛，而且它们为了呼吸，要被迫浮出水面，”合著人卡琳娜。阿塞维多·怀特豪斯这样告诉探索频道新闻。
The same muscles puff up the feathers of birds and the fur of mammals on cold days to help keep them warm.
在鸟类中也有同样的肌肉，在冬天它使得鸟的羽毛膨胀，以达到御寒的目的。哺乳动物也通过毛发来御寒。
The laboratory typically examines fur, hides, feathers, claws, and teeth, both visually and microscopically, to determine what species a body part came from.
这个实验室通常检验毛皮，兽皮，羽毛，爪子和牙齿，包括目检和显微镜检测，来确定它们是从什么物种身上来的。
The best guesses are that feathers evolved either for insulation (as fur did in mammals) or for display, and that natural selection took advantage by turning them into a means of transport.
对此最好的猜测便是，羽毛的出现要么是为了护身(就像哺乳动物的毛皮)，要么就是为了作秀；此外，自然选择就择优而把某些动物的羽毛变成了它们的交通工具。
Nearly every week for the last seven months, Mr. Ringen, 69, has driven the roads north of this college town near Sacramento, scanning the pavement for telltale bits of fur and feathers.
过去的7个月里，69岁的瑞根先生每周两次在萨克拉曼多附近的大学城开车向北，在人行道上仔细找寻动物被车撞死的蛛丝马迹。
They can take the fur off the back of a cat and the feathers off a chicken.
它们可以将猫背上的皮毛和鸡身上的羽毛拔下来。
They might have had fur, but didn't have feathers.
无齿翼龙也许会有皮毛，但是不会有羽毛。
Animals have been killed for their fur and feathers, for food, for sport, and simply because they were in the way.
动物被杀害的毛皮和羽毛，食物，运动，仅仅因为他们的方式。
Animals have been killed for their fur and feathers, for food, for sport, and simply because they were in the way.
人们杀死动物，获得它们的皮毛，把它们当作食物或运动方式，或者只是因为它们碍事。
A long fluffy scarf made of soft material, such as fur or feathers.
她的宠物是一只毛粗而蓬松的狗。
Animals have been killed for their fur and feathers for food for sport and simply because they were in the way.
动物被杀害的毛皮和羽毛食物运动仅仅因为他们的方式。
Oil harms birds and Marine mammals by causing feathers and fur to lose their natural waterproof quality, which causes the animals to drown or die of cold.
原油使鸟类和海洋哺乳动物的羽毛和毛皮失去了自然的防水能力，结果导致动物淹死或冻死。
Animals shave been killed for their fur and feathers, for food, for sport, and simply because they were in the way.
人们杀死动物，获得它们的皮毛，把它们当作食物或运动方式，或者只是因为它们碍事。
Animals shave been killed for their fur and feathers, for food, for sport, and simply because they were in the way.
人们杀死动物，获得它们的皮毛，把它们当作食物或运动方式，或者只是因为它们碍事。
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