Only about 40 of the roughly 1,000 species of sharks are documented attackers of humans, although another 20-30 species may occasionally attack humans. In comparison, about 1,000 people die from attacks by crocodiles 1,500 from tigers, lions, and leopards and 60,000 from snakebites. The International Shark Attack File, which contains data on shark attacks from around the world, reports more than 120 shark attacks per year, with about 10-15 deaths each year. They have survived the reign of the large reptiles by another 200 million years. The first sharks lived approximately 400 million years ago, about 200 million years before the dinosaurs. Sharks have had remarkable evolutionary success.
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