Allosaurus fragilis

†Allosaurus fragilis was the dominant apex predator of Late Jurassic North America (~155-150 Ma). Reaching 8-9m and ~2,200kg, this large theropod had a distinctive skull with ridges above the eyes, powerful three-fingered arms, and blade-like serrated teeth. Named by Marsh in 1877 from Colorado, thousands of specimens have been recovered, making it among the best-known theropods.

Diet & Feeding

Carnivore

Allosaurus fragilis was a meat-eating predator. Carnivorous dinosaurs were active hunters or scavengers, equipped with sharp teeth and claws for catching and consuming prey. They occupied the top of the food chain in their ecosystems.

Time Period

Jurassic Late Mesozoic Era

Allosaurus fragilis lived during the Jurassic Late period of the Mesozoic Era, approximately 161.5 to 145.0 million years ago.

One of the most iconic periods for dinosaurs. Giant sauropods like Brachiosaurus and Diplodocus roamed alongside predators like Allosaurus. Archaeopteryx, the earliest known bird, appeared. The Morrison Formation preserves an extraordinary fossil record from this time.