Imagine the Western Plains of North America, from Texas to Alaska, submerged under a broad, shallow seaway. To the west lay the ancestral Rocky Mountains. To the east were low-lying plains traversed by large, sluggish rivers.

New work argues the first bird reached takeoff speed with two or three leaps rather than a standing launch.

The first thing that the expedition team found in peeking from the rocks and sands of the Gobi Desert was a tiny tip of a large pelvis. The international team descended on the exposed fossil, and chipped and brushed away to reveal more and more bones. Eventually, they exposed an exceptionally rare find: the virtually complete skeleton of a new dinosaur species.

Nearly a quarter billion years ago an otter-sized, armored, platypus-faced, marine reptile paddled in tropical lagoons on the shores of islands that would become southern China. This weird species is part of a diverse lineage that was restricted to a few million years and those tropical lagoons.

Wadi Al Hitan, the Valley of the Whales, is a site that’s yielded dozens of skeletons of the early predatory whales Basilosaurus and Dorudon over the last hundred years. Newly uncovered specimens support the idea that it was a calving ground for the dolphin-sized Dorudon, and that those calves were hunted by the much larger Basilosaurus.

Extraordinarily well-preserved fossils discovered from the 1970s to the present day show that all pterosaurs were covered in hair-like fibers known as pycnofibers. Two new pterosaur specimens described by Zixiao Yang and colleagues show that some pycnofibers were actually brush- or tuft-shaped and probably share an evolutionary origin with feathers.