The sale of ivory from the tusks and teeth of ... Hippos, killer whales and sperm whales are targeted for their teeth, while narwhals and walruses are hunted for their tusks.

He collected specimens that inspired his theory of Natural Selection.This carved sperm whale's tooth, or scrimshaw, was made on the HMS Beagle. It is made from ivory and was carved by James Bute.

Ten of the intricately-carved pieces have been redisplayed in a case which allows visitors to see their backs for the first time.