(色素), the scientists found that early mammals had dark-brown fur. This is different from the many..., while our ancient relatives, the early mammals (哺乳动物), were much less visible with their plain, dark ……

. That’s why they don’t have green fur. We are all mammals. Take a look at our furs. None of us have... eyes, most tigers are orange. Some are dark orange.Some are light orange.But in some animals’ eyes ……

mammals.A Chinese research team found that 164 million years ago the mammal had a tail like a beaver... in Science last week.Scientists had thought the only mammals alive during the age of dinosaurs were shrew ……

’t tigers just have green fur? Tigers are mammals (哺乳动物). Mammals don’t have green pigments (色素). So... are mammals (哺乳动物). Mammals don’t have green pigments (色素). So, tigers can’t have green fur. ……

squirrel is different. Their fur (皮毛) is colorful, with two or three colors, including black, brown, or dark red. They are one of the world’s most beautiful kinds of squirrels. Even with their bright ……

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Bats (蝙蝠) can fly. Are they birds? No, they are mammals (哺乳动物). ……

The Indian giant squirrel has purple fur. ……

and soft fur (皮毛). They have strong back legs and small front legs. The mommy kangaroo has a pouch (育儿袋) for her kid at the front of her body. Feature Kangaroos have long tails and soft fur ……

-speed videography (摄像) and “fur particle tracking (粒子追踪)” to record the shaking of 33 animals, including 16 animals species and five dog breeds (品种).It turns out that mammals (哺乳动物) keep a large ……

grew light brown coats instead of the usual dark fur. Now, the team will see if these mice can live... of the usual dark fur. Now, the team will see if these mice can live in cold weather and study how ……

animals, sea mammals (哺乳动物) and even insects! To survive in this cold place, they have to have... animals, sea mammals (哺乳动物) and even insects! To survive in this cold place, they have to have some ……

animals, sea mammals (哺乳动物) and even insects! To survive2 in this cold place, they have to have some... mammals (哺乳动物) and even insects! To survive2 in this cold place, they have to have some amazing skills ……

, birds and mammals — developed the ability to fly before pterosaurs.Birds, which first appeared about 150 million years ago, and bats, flying mammals that arose about 55 million years ago ……

species instead.Likewise, possums were introduced because people wanted their fur (皮毛... they spent so long without natural enemy, the birds lost the need to fly. When mammals like rats ……

have fur.c) People have hair, not animals.d) mane: 鬃毛3. Correct answer: a)a) beak: 鸟嘴，喙b) & c) People... in the spring.d) Fish and mammals (哺乳动物) that live in water, like whales, have fins (鳍). They use them to swim ……