Michel Roggo / Rainbow Trout (Oncorhynchus mykiss), on spawning ground. Male approaching female to spawn. Lichtensteiner Binnenkanal, tributary of the Rhine River, Lichtenstein, January.

Michel Roggo / Rainbow Trout (Oncorhynchus mykiss), on spawning ground. Male approaching female to spawn. Lichtensteiner Binnenkanal, tributary of the Rhine River, Lichtenstein, January.

Michel Roggo / Rainbow Trout (Oncorhynchus mykiss), on spawning ground. Male approaching female to spawn. Lichtensteiner Binnenkanal, tributary of the Rhine River, Lichtenstein, January.

Michel Roggo / Rainbow Trout (Oncorhynchus mykiss), on spawning ground. Male approaching female to spawn. Lichtensteiner Binnenkanal, tributary of the Rhine River, Lichtenstein, January.

Michel Roggo / Rainbow Trout (Oncorhynchus mykiss), on spawning ground. Male approaching female to spawn. Lichtensteiner Binnenkanal, tributary of the Rhine River, Lichtenstein, January.

Michel Roggo / Rainbow Trout (Oncorhynchus mykiss), on spawning ground. Male approaching female to spawn. Lichtensteiner Binnenkanal, tributary of the Rhine River, Lichtenstein, January.

Markus Varesvuo / Lichtenstein's Sandgrouse (Pterocles lichtensteinii)male, Israel, May

Tui De Roy / Lichtenstein's Sandgrouse (Pterocles lichtensteinii) female, Loisaba Wilderness, Kenya

Tui De Roy / Lichtenstein's Sandgrouse (Pterocles lichtensteinii) male, Borana Ranch, Kenya

Tui De Roy / Lichtenstein's Sandgrouse (Pterocles lichtensteinii) male and female, Borana Ranch, Kenya

Pete Oxford / Lichtenstein's Hartebeest (Alcelaphus lichtensteinii), a re-introduced species, Kruger National Park, South Africa

Hanne & Jens Eriksen / Feather detail of Lichtenstein's sandgrouse {Pterocles lichtensteinii} Oman

Hanne & Jens Eriksen / Lichtenstein's sandgrouse (Pterocles lichtensteinii) male camouflaged amongst rocks. Wadi Aydam, Oman.

Dietmar Nill / A row of Lime trees (Tilia sp) in the snow near Lichtenstein, Germany

Hanne & Jens Eriksen / Lichtenstein's sandgrouse {Pterocles lichtensteinii}, female, on stony ground, Socotra Island, Yemen

Hanne & Jens Eriksen / Lichtenstein's sandgrouse {Pterocles lichtensteinii}, male, on stony ground, Socotra Island, Yemen

Hanne & Jens Eriksen / Lichtenstein's sandgrouse {Pterocles lichtensteinii} male, on stony ground, Socotra Island, Yemen

Hanne & Jens Eriksen / Lichtenstein's sandgrouse (Pterocles lichtensteinii) male, Tiwi, Oman

Hans Christoph Kappel / Black Throated Oriole {Icterus gularis} Yucatan, Mexico

Claus Meyer / Black Mussurana (Clelia occipitolutea) snake, eating a Hognose Snake (Philodryas nattereri), Caatinga ecosystem, Brazil

Claus Meyer / Black Mussurana (Clelia occipitolutea) snake, eating a Hognose Snake (Philodryas nattereri), Caatinga ecosystem, Brazil

Pete Oxford / Hog-nosed Snake (Leioheterodon modestus) camouflaged amid leaf litter, Ankarafantsika Special Reserve, Madagascar