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。
Inter and intraspecific conflict and competition, and cooperation, are part of nature in most species.
种族内和种族间的冲突和竞争，还有合作，是大多数种族的一种天性。
Inter and intraspecific conflict and competition, and cooperation, are part of nature in most species.
种族内和种族间的冲突和竞争，还有合作，是大多数种族的一种天性。
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