Which mammal can dive for the longest time?
CUVIER'S BEAKED WHALE 2 hours and 18 minutes Apart from holding its breath, the whale can dive to a record depth of 2,992 m.
ELEPHANT SEAL 2 hours Carbon monoxide in its blood may help an elephant seal dive deep to catch rays.
SPERM WHALE 90 minutes A flexible chest ensures that the lungs can collapse to enable extremely deep dives.
WEDDELL SEAL 70 minutes Myoglobin in the seal's muscles stores oxygen, which the seal "eats" under the ice.
SLOTH 40 minutes Very slow metabolism lowers the creature's pulse by 2/3, reducing oxygen consumption.