虎是独居动物。
这是一种夜行独居动物，在野外甚少看到。
A solitary and nocturnal animal, it is not often seen in the wild.
赤狐是独居动物，以捕猎啮齿动物、兔子和鸟类为食，或玩点其他的花招- - -它们的日常饮食如同它们的住所一样是可以灵活多变的。
Red foxes are solitary hunters who feed on rodents, rabbits, birds, and other small game-but their diet can be as flexible as their home habitat.
牛津大学的最新研究成果表明，经过数百万年的漫长进化，如今的狗类较之猫类拥有更大的脑。这是因为与独居动物相比，高度群居类的哺乳动物需要运用更多的脑力。
Over millions of years dogs have developed bigger brains than cats because highly social species of mammals need more brain power than solitary animals, according to a study by Oxford University.
而许多独居哺乳动物的脑——例如猫、鹿以及犀牛——则在同时期内发育较为缓慢。
The brains of more solitary mammals, such as cats, deer and rhino, grew much more slowly during the same period.
下列哪种动物是独居的？
当然，如果动物生活在过于拥挤的群体或喜欢独居的动物被安置在群体里，它们所承受的压力和痛苦是很真实和鲜明的。
Of course, the reverse is also true. If an animal is in overcrowded conditions or a truly solitary animal is kept in a group, they may be stressed and suffer as a result.
其它的猫科动物喜欢独居，如老虎。
熊是天性喜欢独居的动物。但是，如果面对着满河活蹦乱跳、只等落入熊掌的鲑鱼，它们有什么理由不破例走到一起？ ！
By nature, bears are solitary creatures - but when there's a river full of fish ready to leap straight into your PAWS, they will make an exception.
而在同一时期内，像猫、鹿和犀牛等喜爱独居的动物的大脑发育则相对迟缓。
The brains of more solitary mammals such as cats, deer and rhino, grew much more slowly during the same period.
而在同一时期内，像猫、鹿和犀牛等喜爱独居的动物的大脑发育则相对迟缓。
The brains of more solitary mammals such as cats, deer and rhino, grew much more slowly during the same period.
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