Stand next to a T. rex.
Rexo shows 28 dinosaurs and prehistoric reptiles at their real size next to you and a bus. Find out when they lived, what they ate, where their bones were found, and test yourself with a quiz.
Dinosaur explorer
Tap a card to see its real size next to a person.
When did they live?
Dinosaurs ruled for 165 million years. The number is million years ago. Tap a name for details.
Compare two
Pick any two animals to see them side by side at true scale.
Dino quiz
10 quick questions. How many can you get right?
Questions
Are the sizes exact?
No one has weighed a living dinosaur, so sizes are scientists' best estimates from fossils, rounded. New finds can change them.
Why are Pteranodon and Mosasaurus 'not dinosaurs'?
They lived at the same time but belong to other reptile groups: pterosaurs flew and mosasaurs swam in the sea. Birds, though, are living dinosaurs.
Did dinosaurs live in India?
Yes. Rajasaurus, Isisaurus and Barapasaurus are Indian dinosaurs, and dinosaur eggs have been found in Gujarat and Madhya Pradesh.
Is Rexo good for school?
Yes. It is free, works offline after the first visit, and the quiz is a fun way to revise.