ิbasking in sunlight a sperm whale rests after its journey from the black depths of the ocean sperm whales are the deepest diving of all mammals and can spend up to ninety minutes on the sea floor hunting giant squid and other bottom dwellers like mammals on land all whales and their dolphin cousins are warm-blooded and need to breathe air so,how have whales adapted terrestrial organs to a lite at sea so successfully? and what prompted their ancestors to move from the land to the oceans