The initial split was into synapsids (mammals and their relatives) and sauropsids (reptiles and birds). Mammals branched off from other amniotes very early. Several mammalian characteristics are ...

Yet, the earliest known ancestors of modern mammals more resembled reptiles, with limbs stuck ... marked a pivotal moment in evolution. It involved a major reorganization of limb anatomy and ...

"Reptiles don't cut up their food," says ... All this done by the most intelligent of mammals. Evolution has given us this gift of intelligence, but are we too smart for our own good?

Much like many reptiles and birds today ... Some ancient traits were lost and had a major influence on mammal evolution. One ...

The outer ear is unique to mammals, but its evolutionary ... and fish gill enhancers could be used to follow the evolution of ...

A new study of modern reptiles will improve our ability to identify the diets of ancient animals, including dinosaurs.

Only a handful of mammals can regrow teeth multiple times, compared to the 50,000 species of reptiles and fish. Take geckos, for example, who will replace all 100 teeth, or so, every 3 to 4 months.

Tritylodontids were a mammal-like reptile group of herbivores the size of rabbits and hares. They were halfway in the evolution process from reptiles to mammals. The Ono site is the fourth in ...

it lays eggs like a bird or reptile but feeds milk to its young like a mammal. Males also have a pair of venomous spurs on their hind feet, but they don't use them for traditional attack or defence.