Many blacktip reef sharks in French Polynesia are commonly fed by tourists. But the low-quality diet is changing the sharks’ behavior and physiology.

Jace Tunnell captured the alligator gar's multiple rows of teeth.

Shortfin makos are the fastest sharks in the sea, but they're failing to outpace the scale of overfishing that is driving ...

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Frederick Walker — accompanied by his wife, three adolescent sons and a crew of 24 — left Hong Kong in the fall of 1887, bound for the Midway Atoll, where they intended to hunt sharks.