Their ancestors appeared around the same time as the first small mammals, and they were probably able to survive because they were evolving— and growing—at the same time as their mammalian predators.
Ich przodkowie pojawili się w tym samym czasie, co pierwsze małe ssaki. Przetrwały dzięki ewolucji i wzrostowi w tym samym czasie, co ich drapieżcy, ssaki.