A giant hand belonging to Therizinosaurus. (Ghedoghedo, Wikimedia)
Therizinosaurus was one of the strangest dinosaurs known. Only fossils of its arms and legs have been found to date and those arms were weird. They were large, really large and had massive claws. Cheloniformis means “turtle form” because, when the arms were first found, scientists thought they had found a turtle.
Closely related species allow palaeontologists to suggest how Therizinosaurus looked. Most likely it had a wide body, long neck and quite a small head.
Discovery: originally found in 1948, it was named by a Russian scientist in 1954.
Height: Maybe 3m, but palaeontologists can’t be sure.
Length: It is estimated that it could be 10m.
Weight: very roughly estimated at 4500kg.
Where it lived: Mongolia
When it lived: A Cretaceous dinosaur, it lived 75-70 million years ago.
What it ate: Palaeontologists don’t know, the skull or stomach is the best place to find out but both are missing. They suspect it was vegetarian based on related species.
Weapon of choice: Its claws are the longest known of any animal that has ever lived and could have measured 1m long (70cm long bone covered in a a sheath). These claws were deadly but they may have been used mainly for finding food.
Weakness: Not enough is known about this species to know its weakness but closely related species were slow and cumbersome.