TONI ANGERMAYER / SIGI KOSTER / SCIENCE PHOTO LIBRARY TONI ANGERMAYER / SIGI KOSTER / SCIENCE PHOTO LIBRARY
Sperm whale. Silhouetted head of a sperm whale (Physeter catodon, or macrocephalus). A sperm whale can remain underwater for up to 90 minutes and reach depths of over 1000 metres. It does this to pursue its prey, mainly large squid. These giant squid may reach ten metres in length. A fully-grown male sperm whale may be over 20 metres long, although females rarely exceed 12 metres. The sperm whale lives throughout the world's oceans, although it rarely strays into colder polar waters. It lives in groups (or pods) of one or two males and several females and young. The sperm whale communicates using squeaking sounds.
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