CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Sperm whale and giant squid. Computer artwork of a sperm whale (Physeter catodon, or macrocephalus, left) hunting a giant squid (Architeuthis sp., at right). Sperm whales can reach 18 metres in length and giant squid can be up to 10 metres long. Sperm whales are toothed whales (teeth seen in lower jaw), though the teeth are thought to be used in aggression between males, rather than eating. Sperm whales dive deep (over 1000 metres) to hunt their main prey, giant squid. The squid can defend itself with suckers and sharp beak, and scars are found on whales from these defences. However, the giant squid is rarely seen, most often found in a sperm whale's intestines or washed up on a beach.
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