Whales: The Sperm Whale (Physeter macrocephalus)
by Della Watson
Sperm whales have one of the the lowest reproductive rates of mammals (2nd only to some populations of Orangutan)—they’re able to give birth to a single calf every four to six years at their reproductive peak—and the largest brain of any living creature on the planet. These highly social animals often raise their young communally.
Photography by Flip Nicklin/Minden Pictures, from Among Giants
(via: The Sierra Club)
