(CNN)As it turns out, whale sharks -- the biggest fish in the seas -- are gluttons for crabs. So, find a spot rich in crustaceans, and these beasts will surely follow, which is why Djibouti's coast has become a prime spot for shark whale-watchers. For a few months every year the largest of the 500 species of shark gather in the tropical waters in the Gulf of Tadjoura to feast on crab in their natural spawning grounds. It may seem like an easy-win for scientists and tourists alike, but the sharks are slippery customers, as elusive as they are beautiful. However with the help of satellites and laser beams, scientists are better equipped to uncover the whale shark's mysterious migration...
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