Bence Mate / Red footed falcon (Falco vespertinus) pair mating, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.

Bence Mate / Flock of Mallard ducks (Anas platyrhynchos) taking off, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. December.

Brais Seara Fernandez/ BIA / Indian Peafowl (Pavo cristatus) female watching male performing courtship display, Castilla Leon, Spain

Lou Coetzer / Pintailed whydah (Vidua macroura) male displaying to female, Masai Mara, Kenya.

Andres M. Dominguez / Red deer (Cervus elaphus) stag and two hinds, Los Alcornocales Natural Park, southern Spain, September.

Wim van den Heever / African lion (Panthera leo) male female pair reflected in water, Okavango Delta, Botswana

Markus Varesvuo / Female Capercaillie (Tetrao urogallus) ready to mate, Vaala, Finland, May.

Donald M. Jones / Elk (Cervus elaphus) bull and harem of females and calves along river, Athabasca River, western Canada

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, ewe, and lamb, western Canada

Rick Bowers/ BIA / Gambel's Quail (Callipepla gambelii) male at left with female, Arizona

Thomas Marent / Gelada Baboon (Theropithecus gelada) male and females huddling for warmth, Simien Mountains National Park, Ethiopia

Roland Seitre / Svalbard Reindeer (Rangifer tarandus platyrhynchus) male and females running, Spitsbergen, Svalbard, Norway