Elephant seals are amazing!

Look at those dive stats (20 - 30 min for up to 5,000 lb males, and 2,000 feet for up to 1,500 lb females - crazy!)
NOW I understand why they are being so lazy, resting on the beach.

Elephant seals were thought to be extinct. But a small colony still existed (had not been harvested by humans - for their blubber/oil) on Guadalupe Island off Baja CA. They returned of their own accord to this beach in 1990, and now they are not hunted by humans - and thriving, again.
Amazing story.