Sinornithosaurus

Filed under Cretaceous dinosaurs · Types of Dinosaurs editorial team

Order: Saurischia · Suborder: Theropoda · Infraorder: Dromaeosauridae · Family: Dromaeosauridae

Sinornithosaurus, whose name means "Chinese bird-lizard," was a small carnivorous dinosaur from the Early Cretaceous period that roamed what is now China. Measuring approximately one meter (about three feet) in length, it belonged to the dromaeosauridae family—the group of agile predators known for the curved sickle claw on each of their feet. This compact hunter was lightly built, suited for swift movement and precision strikes against prey.

Sinornithosaurus holds considerable significance in paleontology as one of the early discoveries that proved small theropod dinosaurs were covered in feathers. Fossils of this species preserve remarkably clear impressions of feathering across the body, ranging from simple filament-like structures to more elaborate feather forms. These physical characteristics demonstrate just how bird-like these small raptors were in life, providing tangible evidence for the evolutionary connection between dromaeosaurs and modern birds. The creature exemplifies the growing scientific understanding that many theropod dinosaurs possessed adaptations and appearances far closer to avian ancestors than previously suspected.

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Reference background: Natural History Museum, London — Dinosaurs; Smithsonian National Museum of Natural History — Dinosaurs; American Museum of Natural History — Dinosaurs & Fossils. Figures are typical published ranges; taxonomy follows the source era and modern consensus is noted where it differs. See our sources & fact-check policy.

Related dinosaurs

Other dinosaurs from the Dromaeosauridae family.