Viviparity, the live-bearing mode of reproduction, has evolved independently in several vertebrate lineages, including squamate reptiles and seahorses. In reptiles, evolutionary transitions from ...

In a lab at the University of Sydney, a female yellow-bellied three-toed skink first laid eggs, then gave birth to a live baby, all part of the same pregnancy. This is the first time biologists have ...

The study revealed unexpected and sex-specific effects of germline regulation on longevity and somatic repair in vertebrates. Contrary to classical evolutionary theories, it turns out that changing ...

What really did come first--the chicken or the egg? Birds' reproductive biology is dramatically different from that of any other living vertebrates, and ornithologists and paleontologists have long ...