Jeff Vanuga / Shiras moose (Alces alces shirasi) bull in rut. Grand Teton National Park, Wyoming, USA, October.
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Anup Shah / African elephant (Loxodonta africana) walking toward camera, Maasai Mara National Reserve, Kenya.
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Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, Mirissa, Sri Lanka, Indian Ocean. Endangered species.
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Steven Kazlowski / Polar bear (Ursus maritimus) juvenile crossing over newly forming pack ice, during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska
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Inaki Relanzon / RF - White rhino (Ceratotherium simum) mother and calf, Nakuru National Park, Kenya. (This image may be licensed either as rights managed or royalty free.)
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Danny Green / RF - Brown Bear (Ursus arctos) in the snow, Finland. April. (This image may be licensed either as rights managed or royalty free.)
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Cyril Ruoso / Close up of Sumatran rhinoceros (Dicerorhinus sumatrensis) rear view of female, part of a breeding program, Way Kambas National Park, Sumatra, Indonesia.
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Denis-Huot / RF- Serval cat (Felis serval) Masai-Mara Game Reserve, Kenya. (This image may be licensed either as rights managed or royalty free.)
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Denis-Huot / RF- African Elephant (Loxodonta africana) herd walking in line. Amboseli National Park, Kenya. (This image may be licensed either as rights managed or royalty free.)
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Andy Rouse / RF- Polar bear (Ursus maritimus) on pack ice. Svalbard, Arctic. Endangered species. (This image may be licensed either as rights managed or royalty free.)
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Peter Cairns / RF- Bison (Bison bison) mother with two calves in summer meadow. Yellowstone National Park, Wyoming, USA. (This image may be licensed either as rights managed or royalty free.)
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Tony Heald / RF- African elephant herd (Loxodonta africana). Hoarusib river, Kaokoland, Namibia. Endangered species. (This image may be licensed either as rights managed or royalty free.)