Smile and the world smiles back at you...
If you stare into the Abyss long enough the Abyss stares back at you.
mutated rapewhale?
Blainville's beaked whale, I presume?
We have a winner! Also known as the Dense-beaked whale, Mesoplodon densirostris is a deep diving cetacean which has the most dense bone of any known vertebrate.