A wily old leopard is hiding in a gully waiting for the perfect moment to strike. Nearby, zebras and antelope graze contentedly, unaware of the threat they’re under.

Oxpeckers perform a valuable service to hippos, keeping their skin free of ticks and dead skin. But they've also been known to keep host wounds open, so they can feed off the flesh.

Herring in the sea of Okhotsk only lay their eggs once the temperature of the water has reached 40 degrees. This is important news for the vulnerable Steller’s Sea Eagles who rely on the herring for food.

Investigators discover that the Galloping Ghost, the plane that crashed at the Reno Air Races on September 16, 2011, had its wings modified to make it faster. Was this a factor in its loss of control?

A team of researchers are on the trail of a black rhino bull whose transmitter has failed. To find him, they’ll rely on his spoor: clues such as urine trails, footprints and food he may have grazed on.

The B-17 enabled the eighth Air Force to embark on a type of bombing campaign not seen before in the war: daylight bombing missions, aimed at minimizing civilian casualties.

A young female orangutan spots something across the water. To investigate, she wades in and begins to swim – startlingly unusual behavior for an orangutan.

Investigators looking into the crash of Aeroflot-Nord Flight 821, which crashed on September 14, 2008, ran into a lot of dead ends: from a totally destroyed engine to a badly damaged flight data recorder.

At the chimp haven on Ngamba island, a 2-year-old orphan by the name of Easy spends most of his day slowly learning the skills that will help him reintegrate into chimp community.

Britain was racked by devastating economic hardship in the 1930s and ordinary people began to take their anger out on what was seen as the ultimate symbol of entitlement: the British Royal family.