Bull sharks push far upriver to breed, and this one proved it. This moment captures the realization that the fish on the line was not just big, but dangerous.

The bumphead sunfish (Mola alexandrini) is one of the strangest and most impressive giants in the ocean. With a flattened, ...

The natural world has produced some of the most potent poisons known to science. Here are some of the deadliest to humans ...

Australia has closed dozens of beaches and urged people to stay out of the ocean after a fourth shark attack was reported ...

Nature's deadliest arsenal lurks in the shadows of oceans, forests, and deserts, where tiny creatures wield toxins far ...

Irukandji jellyfish deliver one of the most painful possible stings. Learn what the experts say about the dreaded Irukandji ...

Ciguatera—a toxin that accumulates in reef fish—is a common cause of seafood poisoning. Learn which fish are safest to order ...