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Sperm Whales are an endangered species, although they are still fairly numerous. However, selective killing of the larger breeding-age males over too many years upset the ratio of male to female, seriously decreasing the birth rate in some populations. They were also particularly hunted for the clear liquid oil (spermaceti) found in a large reservoir in the Sperm Whale's head that hardens to a wax like consistency when cold. They also produce a strange substance called ambergris, found in large lumps in their lower intestine formed around squid beaks that remain in the stomach.

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