Martin Dohrn / Three hyenas (Crocuta crocuta) approaching a resting lion (Panthera leo) at night. Topi Plain, Masai Mara, Kenya. Image taken using an infared camera with no artificial visible light, on location for...

Martin Dohrn / Group of hyena (Crocuta crocuta) playing in deep rain puddle at night. Topi Plain, Masai Mara, Kenya. Image taken using "starlight camera" with no artificial light, on location for National Geographi...

Martin Dohrn / Thermal camera image of hippos (Hippopotamus amphibius), crocodile (Crocodylus niloticus) and wildebeest (Connochaetes taurinus, far left) on the banks of the Mara River, Masai Mara, Kenya. Image take...

Martin Dohrn / Sleeping African elephants (Loxodonta africana), two adults and offspring, Masai Mara, Kenya. Image taken at night using thermal camera technology without artificial light.

Martin Dohrn / Hippo (Hippopotamus amphibius) in threat pose, Masai Mara, Kenya. Image taken at night using thermal camera technology without artificial lighting.

Martin Dohrn / Lions (Panthera leo) approaching rhinoceros, Masai Mara, Kenya. Photographed at night using 'Starlight Camera' technology without artificial lighting.

Martin Dohrn / Pride of lions (Panthera leo) in Masai Mara, Kenya. Photographed at night using 'Starlight Camera' technology without artificial lighting.

Martin Dohrn / Lionesses (Panthera leo) killing zebra, Masai Mara, Kenya. Image taken at night using thermal Camera technology without artificial lighting. Can only be used if National Geographic "Night of the Lio...

Michael Durham / Red Imported Fire Ant (Solenopsis invicta), also known as RIFA, worker portrait, highly invasive introduced species, Texas

Martin Dohrn / Lenticular clouds forming over the Italian Alps

Martin Dohrn / Aerial view of deciduous autumn woodland, Puy de Dome, France

Martin Dohrn / Aerial view of yellow taxi cabs and other traffic reflected in glass of skyscraper in New York city, USA