All members of a species can in principle mate with members of the same species but of the different sex. Two populations would not be considered part of the same species if they do not actively breed (even if they potentially could).

Question

Quizplus · Accepted Answer

The biological species concept defines species based on the ability to interbreed and produce fertile offspring, not on whether they actively do so in nature. Two populations might not interbreed due to geographical, behavioral, temporal, or ecological barriers, but they can still be considered the same species if they are capable of interbreeding under natural conditions.

All Members of a Species Can in Principle Mate with Members