Several different species of whale can be seen off Kaikoura at different times of the year, but almost always the huge Sperm Whales. Flukes lifting clear at the start of the deep dive, adolescent male Sperm Whales enjoy the rich diet of the Kaikoura waters while building up their strength to move to the mating grounds of the warm north. Regularly diving to depths of one kilometre, Sperm Whales have been known to dive to 3 kilometres, holding their breath for up to two hours - perhaps gulping down a few groper or wrestling with a giant squid.