March 14, 2011 by Juliet Grable
They can plunge to depths of more than a mile and stay submerged for 90 minutes without coming up for air. They can swim up to 14,000 miles a year. The males can weigh over two and a half tons. You could say elephant seals are "Extreme Mammals," record-holders in several categories, including deepest divers. And with new tracking methods, we're learning more than ever about these amazing creatures.