A beautiful photo collection of whales, one of the largest marine mammals

Whales are large, intelligent, aquatic mammals. They breathe air through blowholes into lungs unlike fish who breathe using gills. Whales have sleek, streamlined bodies that move easily through the water. They are the only mammals, other than manatees (seacows), that live their entire lives in the water, and the only mammals that have adapted to life in the open oceans.