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。
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。
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