Copyright 2005 TravBuddy LLC http://www.travbuddy.com/blogs/24721 Elephant Seals! Packed together like sardines (?) The Northern Elephant Seal, Mirounga angustirostris , is an extraordinary marine mammal. It spends eight to ten months a year in the open ocean, diving 1000 to 5000 feet (one mile!) deep for periods of fifteen minutes to two hours, and migrating thousands of miles, twice a year, to its land based rookery for birthing, breeding, molting and rest. en-us