Dinosaurs · Large theropod

Alectrosaurus

Say it ah-LEK-tro-sore-us. The name means ‘eagle lizard’.

Alectrosaurus beside a person 1.75 m tall. Ticks mark every metre.Body shape drawn for this site, showing the general build of large theropods

Length: 5 m
Diet: Meat-eater
When: Late Cretaceous90 to 70 million years ago
Fossils found in: China, Mongolia
Named by: Gilmore (1933)
Family tree: Dinosauria › Saurischia › Theropoda › Tyrannosauroidea

Where Alectrosaurus sits in the age of dinosaurs.Periods from the ICS chart; dinosaur dates from the Natural History Museum

Large theropods. Big two-legged meat-eaters, such as Tyrannosaurus. See all 63

Lived at the same time

Archaeornithomimus · same country
Sonidosaurus · same country
Tanius · same country
Microceratus · same country
Anserimimus · same country
Borogovia · same country
Bactrosaurus · same country
Micropachycephalosaurus · same country

Other large theropods

Nothronychus Late Cretaceous
Rugops Late Cretaceous
Anserimimus Late Cretaceous
Aucasaurus Late Cretaceous
Dryptosaurus Late Cretaceous
Gigantoraptor Late Cretaceous
Majungasaurus Late Cretaceous
Nanshiungosaurus Late Cretaceous

Source: Alectrosaurus in the Natural History Museum Dino Directory, read 12 November 2026. Sizes are the museum's estimates for a typical adult. "Lived at the same time" lists dinosaurs whose dates overlap, which does not always mean they met.