Photo of the day

Western Wyoming, Grand Teton National Park: In the untamed early days of the American West, pronghorn were plentiful, proud and moved freely. One small herd of around 200 follows its ancient migration. Driven by the seasons, their migration from the mountains to the valleys and back has always been a tough journey, but now fences, borders, bloated rivers and other constraints have created blockades and bottlenecks that result in devastating losses for this critically endangered species. This image is from Move or Die.

Jordan: Excavation at Tall el-Hammam. This image is from Buried Secrets of The Bible with Albert Lin.

A puff adder digs in. This ambush predator swiftly injects its prey with up to 350 milligrams of cytotoxic venom. This image is from World's Deadliest Lion.

Lhakpa Jangba talks about losing his family during the avalanche in Langtang. This image is from Witness to Disaster.

A moose seen from overhead as it walks through the snow. In Wild_Life: The Big Freeze, filmmaker Bertie Gregory travels to the Canadian Arctic and braves freezing temperatures for rare encounters with polar bears, wolves, harp seals and other wildlife. This image is from Wild_Life: The Big Freeze.

This leopard used tree-climbing abilities to its advantage, leaping down to surprise his kill and dragging prey over twice its weight up to avoid the envy of others. This image is from World's Deadliest Lion.

Costa Rica: The colonies of Eciton burchelli, an army ant, range in size from 300,000 to 700,000. Swarms of E. burchelli can reach 15 yards wide. The swarm raid allows the ants to capture a wide variety of prey by swarming around the prey and closing in on all sides, so that they cannot escape. This image is from Move or Die.

Portugal: Landscape scorched by wildfire in Pedrógão Grande region, Portugal. This image is from Witness to Disaster.

Meerkat sentries stand guard over their home, prepared to take on any less-than-friendly neighbors. Sometimes they may run away, but on some occasions they will fight brutal battles. This image is from World's Deadliest Lion.

Cairo, Egypt: (Left to right) Albert Lin and Dr Meredith Brand inspect the Merneptah Stele at the Egyptian Museum, Cairo. This image is from Buried Secrets of The Bible with Albert Lin.

Peregrine falcons fly with speed and precision that makes taking a pigeon down mid-flight an easy task. They're used in some airports to prevent bird-plane collisions, increasing flight safety. This image is from World's Deadliest Lion.