独处型的物种，例如老虎、家养的猫、以及犀牛，它们的脑里具有更少的灰质。
Solitary species - such as tigers, domestic cats and rhinos - have less grey matter, the scientists found.
Lympne港口拥有今年最受欢迎的牛羚，疣猴，大猩猩以及犀牛。
Port Lympne has this year welcomed wildebeest, colobus monkeys, gorillas and rhinos.
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.
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