Imagine a world where furry mammals scuttle under the feet of gigantic dinosaurs, not yet destined to rule the Earth. It’s a ...

Skulls of two ancient mammal relatives, or synapsids, showing the approximate inferred sizes of the ancestors of two of the major synapsid evolutionary diversifications. Varanosaurus (below), from ...

The Synapsid and Parareptile Collection includes both non-mammalian synapsids and Mesozoic mammaliaformes. The first collections at the Museum were acquired in 1853, with the transfer from the ...

The study involved digitizing the fossil skeletons of extinct synapsids, creating digital biomechanical models of the musculoskeletal system of the hindlimb, and using these models to compute the ...

Amniotes split into the sauropsids (leading to birds and reptiles) and synapsids (leading to mammal-like reptiles). These small early mammals developed hair, homeothermy, and lactation (red lines).