3D? I tried crossing my eyes, and all I got was the Mona Lisa.
Just saw an interesting little post on Sirenia (manatees, dugongs, and sea cows) and Pinnipedia (the seals, walruses, and sea lions):
biomedicalephemera: One of these things is not like the other...
Sirenia (manatees, dugongs, and sea cows) and Pinnipedia (the seals, walruses, and sea lions) are often seen as very similar, but they came from very different lineages.
While both came from land mammals (just like all sea mammals), the pinnipeds evolved from a bear-like ancestor, who returned to the sea around 28 MYA. They’re Caniformidae, or dog-like Carnivora.
The sirens evolved from the same ancestor as the hyraxes and elephants, and returned to the sea around 50 MYA. They’re only distantly related to Cetaceans and Pinnipeds.
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