Emma van Dijk

These spotted dolphins (Stenella frontalis) off Bimini in the Bahamas are part of a study in how they communicate with each other.

Soft coral porcelain crab. Anilao, Philippines

The market in Nizwá highly prizes local pomegranates grown in a high-altitude microclimate—especially al halou, “the sweet one.”

The full moon rises behind the ancient Temple of Poseidon in Cape Sounio, Greece, ahead of the July 27 lunar eclipse.

Both spinners and bottlenose dolphins pod through the turquoise waters off Mauritius. Encircled almost entirely by coral reefs, the island nation is a calm-water refuge for both snorkelers and 400-plus marine animal species.

40 below zero with the windchill. Everything frozen. Beautiful sight.

Tent caterpillars defend themselves with numbers: if a predator finds them, it will be busy snacking on just a few caterpillars—leaving the rest free to escape.

Who needs a blow-dryer? An African lion has found a natural way to tame its mane.

Yellowstone National Park, which extends into Montana, Wyoming, and Idaho, is a haven for Rocky Mountain fauna, including bison (seen here), elk, mule deer, bighorn sheep, grizzly bears, black bears, wolves, moose, and mountain lions.

The Hornsund fjord is viewed through glacier ice in Svalbard, Norway’s Arctic archipelago.

A man bends under the weight of his load on Qeshm island, Iran.

Climbers approach a gendarme along a ridge while ascending Engineer Mountain in the San Juan Mountains of Colorado.