In this edition of “Ask a Marine Biologist,” Dr. David Shiffman discusses a challenging environment for marine life.

On a late-night dive in Sitka, Alaska, two divers encounter myriad fascinating creatures, including a giant Pacific octopus on the prowl.

Discover how to ethically (and legally) swim with wild dolphins. Learn about respecting their space and behavior and choosing responsible tour operators to ensure both your safety and the well-being of these marine mammals.

Masters of disguise, the leafy sea dragon is one of the trickier ocean critters to spot. Here's why these mythical-looking animals dazzle us—and how to take the perfect photo.

Great whites get all the glory, but bottom-dwelling sharks bring plenty to the table. Here, we're looking at some of our favorite seabed shark species.

Dive into a bit of history in the waters surrounding this remote Antarctic island, the site of famed explorer Sir Ernest Shackleton's harrowing journey.

Climate change is threatening the Maldivian sea turtle population. This is how local resorts are teaming up to protect them.

Nudibranchs may look beautiful and delicate, but these sea slugs have some of the ocean's best defenses, making them worthy adversaries against would-be predators. Here's how to photograph them.

Sitting in just 30 feet of water off Panther Point in British Columbia, the Panther is a nearly 200-year-old three-masted clipper wreck teeming with marine life.