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Fossil Points to Live Birth in a 236‑Million‑Year‑Old Mammal Ancestor

Based on a rare neonatal growth mark and comparisons with modern species, the authors call for more specimens to test their claim.

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Study Finds Dinosaurs Were Barred From Evolving into Very Small Body Sizes

550-Million-Year-Old Worm Shows Population Bias for Rightward Turns

520-Million-Year-Old Fossils Confirm Bryozoans in the Early Cambrian

Study Finds Stronger Skulls Often Preceded Arm Loss in Large Meat‑Eating Dinosaurs

Study Links T. Rex’s Tiny Arms to Bigger, Stronger Skulls

New Cretaceous Bird Plumadraco Has Tail Feathers Twice Its Body Length

Study Links Tiny Theropod Arms to Bigger, Stronger Skulls

Study: T. rex Arms Shrank as Skulls Became the Main Weapon

Study Links Tiny T. rex Arms to the Rise of Powerful Jaws

New Fossils and Geochemistry Redraw Origins of Complex Life

New Dinosaur Xiangyunloong Fengming Illuminates Early Path to Giant Sauropods

First Mammal-Ancestor Egg Found Confirms Lystrosaurus Laid Eggs

Chinese Fossil Trove Pushes Complex Animal Origins Into the Ediacaran

Oldest Chelicerate Fossil Dates to 500 Million Years Ago

New Triassic Croc-Line Reptile Grew From Four-Legged Juvenile to Bipedal Adult

Permian Tetrapod From Brazil Reveals Twisted, Plant‑Grinding Jaw

Oldest Articulated Bony Fish and Giant Megamastax Redraw Osteichthyan Origins

Tiny Teeth Found in Colorado Extend Range of Earliest Primate Relative

Ordovician Mass Extinction Set the Stage for the Rise of Jawed Fishes