This deep-sea polar worm looks like it can't decide if it's dressed for a glitzy party or a gruesome massacre.
They are large-bodied and display a mouthful of sharp teeth that protrude in all directions, even when the mouth is shut. Despite this, they are a docile, non-aggressive species, known to attack ...
The fossilized remains belong to Cosmopolitodus hastalis – an extinct mackerel shark closely related to the modern great ...
Related to the T. rex, Albertosaurus are the fastest animal you'll see in Walking With Dinosaurs, and could run up to 30 ...
Sabre teeth can be ideal for puncturing the flesh of prey, which may explain why they evolved in different groups of mammals at least five times ...
But behind the fearsome appearance of saber teeth lies a conundrum. "They're probably really fragile," says paleontologist ...