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If you're planning to go head-to-head with a sea creature, it's probably best to start small.
Only the very brave, or very stupid, would begin a headbutting competition with a 50-ton sperm whale... after all, its head is one third of its overall size.
Nevertheless, here are pictures of a snorkeller doing just that - swimming with his head down right up to a massive whale.
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The amazing pictures were taken off the coast of Dominica in the Caribbean.
Of course, you can't make a 60ft animal do anything against its will, so it's up to the whales to decide if they are in the mood to play. But, when they are feeling sociable, the results lead to amazing pictures like these.
Dominica has become known as the whale-watching capital of the Caribbean. Sperm whales can be seen year-round and - because the ocean floors drops to thousands of feet deep just off the coast - the whales are within easy reach of humans.
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source: dailymail