Scientists found that snake embryos initially curl right because their bodies grow faster than their guts, creating physical ...

The discovery of 280-million-year-old reptile embryos in Brazil and Uruguay has provided paleontologists with the oldest known fossil evidence of amniote embryos. The remains, linked to the aquatic ...

Snake embryos develop in remarkably consistent clockwise spirals, and their slower-growing gut may explain how the unusual ...

A stem-cell-based monkey embryo model that self-organizes into a comprehensive body plan could lead the way to more-sophisticated models of early human development. Xiangyu Kong is in the Department ...

Inside the egg, a growing snake appears to obey a surprisingly simple rule. An embryo of Cape house snake (Boaedon capensis) stained to show developing muscle blocks in the trunk. The embryo shows ...

The earliest days after fertilization, once a sperm cell meets an egg, are shrouded in scientific mystery. The process of how a humble single cell becomes an organism fascinates scientists across ...

Newly found fossils of embryos from the first aquatic reptiles called mesosaurs — along with a pregnant female — may be the oldest known example of birth given to live young instead of eggs, ...