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A juvenile golden trevally, a member of the jack family, swimming just a few inches in front of a highly carnivorous gray reef shark. Specialists believe the behavior makes the jack safer when it swims in close proximity to sharks as it only has to keep track of one potential predator. The jack can react extremely fast if the shark tries to catch it, and no other animal is likely to approach the shark in an effort to pursue the colorful jack. The risk involved is too large for the potential reward. (Photo by Marty Snyderman/Caters News Agency)
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