Sperm Whales (Whales and Dolphins)

Sperm whales have the biggest brains on the planet, but that was not enough to protect them from whalers in the past - and even the present in some countries. The large head of the sperm whale is filled with liquid wax and fat, both used in echolocation. Learn about the clicks, creaks and clangs that sperm whales use to see in the deep, dark ocean and about the giant squid it crunches in its huge teeth. Lively text accompanied by large photos explain the sperm whale's habits and structure and the threats to its survival.Janet Perry is the author of 'Sperm Whales (Whales and Dolphins)' with ISBN 9780836828856 and ISBN 0836828852.