Different species often form due to geographic barriers such as mountain ranges or rivers, which separate populations of the same species until they have become so different that they can no longer ...

Endangered brush-tail rock wallabies raised in captive breeding programs carry antibiotic resistance genes in their gut bacteria and may be able to transmit these genes into wild populations, ...

The Queen gets to tell everyone what to do, and she chooses a few males to breed with, we believe,” says Kerns. “However, she can have one of the largest litters of any mammals, over 30 babies at a ...