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

Researchers say the pattern suggests early motility and coordinated sensory–muscular control that could mark the oldest example of lateralized behavior in animals.

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

New Cretaceous Bird Plumadraco Has Tail Feathers Twice Its Body Length

Study Links Tiny Theropod Arms to Bigger, Stronger Skulls

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

New Fossils and Geochemistry Redraw Origins of Complex Life

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

Fossil Brain Scans Point to Rapid Origin of Pterosaur Flight

Fossil Endocasts Show Pterosaurs Evolved Flight-Ready Brains Independently of Birds

Rare C31 Chemical Fossils Strengthen Case That Sponges Were Among Earth’s First Animals

Jurassic 'False Snake' From Skye Described as New Species, Complicating Snake Origins

Trace Fossils Push Back Cambrian Explosion by 15 Million Years

Triassic Reptiles Migrated 10,000 Miles Through Inhospitable Tropics