The implications here are that these animals recognise that sex leads to babies, and they have some sense of whether or not they were the progenitor of the infants they encounter.

Shorter-lived animals that won't survive to see their offspring grow will typically have more offspring at once. "They can't sit around and crank out babies," Cole said.

This frog’s babies erupt out of its back—and other surprising ways animals give birth Mammals aren't alone—some reptiles, amphibians, and insects give birth to live young.

AMONG papers on various groups of marine animals in serial and other publications which have recently reached us, reference may first be made to a fasciculus of “Illustrations of the Zoology of ...