When David Carrier was handed a copy of `In the Heart of the Sea' it just looked like another good sea-faring yarn about a whaling ship called the Essex, and a sperm whale. As Carrier read about the real life encounter that inspired Herman Melville's `Moby Dick', he began wondering whether a male sperm whale really could successfully destroy a huge wooden ship. Would the mammal have `the right attitude', let alone the physical ability? Could male aggression be the main driving force behind the whale's head butting behaviour? Carrier needed to collect some evidence to support this idea. Collaborating with Jason Otterstrom and Stephen Deban, they began analysing the evolutionary development of the melon structure in the male sperm whale's forehead to see how it would perform in a head on collision. In this issue of the J. Exp Biol., they outline their new theory: that the...

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