Two species of antelope, one from Africa, the other from Asia, are put into the same enclosure in a zoo.

Two species of antelope, one from Africa, the other from Asia, are put into the same enclosure in a zoo. To the zookeeper’s surprise, individuals of the different species begin to mate and produce healthy, hybrid baby antelopes. Explain why a biologist might not view these offspring as evidence that the two species of antelope are in fact one.