Platypuses are weird looking. They look like someone stitched together a duck and a beaver—flat bill, webbed feet, and a ...

Why did our ancestors ditch the shell and start growing babies inside their bodies instead? In this episode of Big Ideas, ...

Monotremes are a class of mammals that are known as egg laying mammals; they are a special group of mammals that lactate to ...

Mammals are animals that have hair, give birth to live young (except the platypus and spiny anteaters), nurse their young with milk produced by the mother, and control their body temperatures from ...

Scientists studying the evolution of birth in lizards, from egg-laying to live births, have pinpointed the evolutionary genes from which the species is evolving to 'build' a new mode of reproduction.