Land animals evolved to live in the Sea

Apparently lots of the marine mammals we know and love were once four-legged creatures. Go here.

With the polar ice caps melting, perhaps we'll evolve to live in oceans. Imagine if one were to inadvertently travel forwards in time 1,000,000 years. All "humans" might be living in the sea and look totally different!

I might initially react 'OMG, the sea is full of large intelligent fish'!