April 25 is World Penguin Day. To celebrate, we’re exploring the world of these wonderful waddlers–from what makes them fun to why we need to protect them.

Patrick Webster chronicles his coldwater adventures onboard Linblad Expeditions, highlighting the fascinating and colorful jellyfish found among polar kelp forests.

Bonito, Brazil is a growing hot spot to dive with anacondas. A snake nicknamed Ana Julia was well-known to the local community. She was recently found dead leaving locals, scientists and filmmakers wondering how she died.

If you have a trip planned to the Indo-Pacific, make sure to learn about these six curious-looking fish before you splash.

The organization ReShark works to help threatened shark populations bounce back in a unique way.

Producers of some of the world’s most potent toxins, ribbon worms are incredibly adept—if underappreciated—hunters. While they pose no threat to humans, their encounters with other sea creatures are the stuff of nightmares.

Few creatures are more fascinating than cephalopods, with their unparalleled (and truly unique) methods for deceiving both predators and prey. It's these methods, in part, that make them the ideal subjects for your underwater photos.