Staffan Widstrand / African bush elephant, (Loxodonta africana) two head to head playing, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa
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Marie Read / Western Grebe (Aechmorphus occidentalis), pair during 'rushing' courtship display in which they run across water's surface in synchrony, near Escondido, California, USA, January.
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Alex Mustard / RF - Bannerfish (Heniochus diphreutes) schooling in coral reef. Long exposure. North Male Atoll, Maldives. Indian Ocean. (This image may be licensed either as rights managed or royalty free.)
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Suzi Eszterhas / Humpback Whale (Megaptera novaeangliae) mother with four day old calf, Tonga
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SCOTLAND: The Big Picture / Pod of Bottlenose dolphins (Tursiops truncatus) surfacing just offshore, Black Isle, Scotland, UK, July.
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Ingo Arndt / Buff tip moth (Phalera bucephala) caterpillars feeding on leaf, Hungary, June.
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Ingo Arndt / Green tree ant (Oecophylla smaragdina) group on entrance from nest, built from woven leaves, Northern Territory, Kakadu National Park, Australia.
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Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) digging their nests by night with stars during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.
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Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) females coming ashore during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.
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Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) crossing road in huge numbers during annual migration, Christmas Island, Indian Ocean, Australian Territory
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Ingo Arndt / Flock of Bramblings (Fringilla montifringilla) perched together in branches. It's estimated that four million individiuals return to roost during winter in Black Forest, Germany. February.
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Carol Walker / Wild pinto Mustang mare and foal running in Sand Wash Basin, Colorado, USA.