If they cannot roost, they cannot breed.
如果他们不能，他们不能繁殖。
Since they can and do successfully inter-breed, they cannot be classed as different species.
既然它们能够而且确实可以成功杂交繁殖，它们就不能被归为不同的物种。
If you have a puppy that will grow into a large breed of dog, you may require various plastic crates while they grow until reaching maturity, as you cannot partition them off.
如果您的小狗将来会成长为大型犬，您就需要各式塑料笼，除非您的爱犬已经完全长大。
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