Dimetrodon

(dye-MET-ruh-don)

Di = two
Metro = size
Don = teeth

This distinctive creature may be familiar to fans of prehistoric animals, but the Dimetrodon is not a member of any dinosaur family. It was actually a pelycosaur, a reptile believed to have many mammal-like characteristics, including warm blood. The Dimetrodons died off long before any real dinosaurs ever appeared.

Not Afraid to Stand Out

The Dimetrodon was unique for having powerful jaws with two kinds of sharp and shearing teeth (the name literally translates as "two measures tooth"). Its other notable feature is obviously the huge dorsal fin on its back, which may have served as a way to absorb heat or to appear larger - and therefore less vulnerable - to predators.

Flirting with Extinction

Other theories suggest that the Dimetrodon used its unusual backbone shape in mating rituals as a way to attract females. Some ladies just can't pass up a great sail.

How's it Look Without the Fin?

With its sharp teeth and claws, a likely ability to run fast over short distances, a long tail and similarly shaped body, Dimetrodon is very comparable to the modern Komodo Dragon.