There are some strange looking animals, but if you turn your eye to the deep ocean, that's where you'll find some truly weird ...

The oceans hold countless secrets - here are five mysterious underwater sites that still puzzle scientists to this day. Dive ...

The frilled shark looks more like a sea monster than anything else, with its serpentine body and strange set of jaws. Its mouth is filled with row after row of needle-sharp teeth — up to 25 rows ...

The Cambrian sea was a very strange and alien place ... Watch First Animals on The Nature of Things.