Moray eels and grouper exhibit an interesting behavior you could observe on your next dive. Here are the signs to look out for.
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Judy G's photography showcases the marine life you can expect to see underwater on the famed reefs of Mexico's largest Caribbean island, Cozumel.
Scuba divers and snorkelers can study the marine ecosystem in Cuba's Gardens of the Queen aboard the floating classroom M/V Oceans for Youth.
Lionfish use venom as a protective mechanism.
Photojournalist Jill Heinerth surveys the fragile marine habitat in the Arctic, where melting sea ice has an ecosystem hanging in the balance.
Conservation organizations are urging people to stay away from seal pups on the beach.