mate, give birth, suckle and raise their young at sea. Whales range in size from the 2.6 m and 135 kg dwarf sperm whale to the 29.9 m and 190 tonnes blue whale, which is the largest known animal that has ever lived. The sperm whale is the largest toothed predator on Earth. Several whale species exhibit sexual dimorphism, in that the females are larger than males.

Baleen whales have