This Bryde's whale was hunting sardines.

Eduardo Acevedo

A wild dolphin swims near the reflective surface of the water.

Christian Vizl

Pilot whales off the island of Tenerife.

Eduardo Acevedo

A close-up shot of spinner dolphins.

Thipphavanh Deovan

Diving with spinner dolphins.

Thipphavanh Deovan

These two dolphins were playing right before mating. This shot made me think of the yin and yang.

Thipphavanh Deovan

As if to say goodbye, the last sperm whale of our expedition disappeared into the deep.

Shane Gross

On a recent family trip to Dominica, we met with this sperm whale calf in the Caribbean waters.

Ellen Cuylaerts

This diver seemed like an underwater maestro.

Ellen Cuylaerts

Here is a pod of spinner dolphins at Kealakekua Bay. Dolphins sleep during the day and hunt at night. They come to rest in bays close to shore and move in patterns deep under the surface, only coming up to breathe. When awake they enjoy some playful behavior — superb to witness!

Ellen Cuylaerts

Dolphins were riding the bow waves of these huge humpback whales. I just couldn't believe I got to witness it!

Shane Gross

Dolphins sleep during the day and hunt at night. They come to rest in bays close to shore and move in patterns deep under the surface, only coming up to breathe. When awake they enjoy some playful behavior, superb to witness!

Ellen Cuylaerts

On the way out to our first dive, a playful group dolphins swam up to our boat to pay us a visit. We immediately grabbed our fins and jumped in to play with our new friends. It's not every day you have such luck!

Sarosh Jacob

A family of dolphins swims in a synchronized formation.

Sarosh Jacob

This pair of pilot whales surfaced and then dived down to join the rest of their pod. This picture was taken while free diving off the Kona coast.

Ron Watkins