Gerrit Vyn / Adult male Eastern Meadowlark (Sturnella magna) singing from a fence post. Anahuac NWR, Texas, USA
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Stephen Dalton / Muscid fly (Muscidae) on glass, viewed from under the glass showing feet, UK, controlled conditions
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Anup Shah / Vervet monkey (Cercopithecus aethiops) two females carrying babies under their bellies, out foraging, Maasai Mara National Reserve, Kenya. Taken with remote wide angle camera.
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Frederique Olivier / Adelie penguin (Pygoscelis adeliae) with markings on bellies from scientific research, Antarctica.
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Anup Shah / Celebes / Black crested macaque (Macaca nigra) females carrying their babies aged less than 1 month under their bellies, Tangkoko National Park, Sulawesi, Indonesia.
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Juergen Freund / Underside of Grey reef shark (Carcharhinus amblyrhynchos) and other fish at North Horn, Queensland, Australia
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Paul D Stewart / Falklands Wolf (Dusicyon australis). 1778 'The Wolf Fox of Faulklands Islands', a copperplate engraving from Commodore Byron's 'An account of a Voyage Round the World'. The Falkland Islands Wolf, Dusi...
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Tim Laman / Golden-bellied crested mona (Cercopithecus pogonias pogonias) male, leaping from tree in rainforest, Bioko Island, Equatorial Guinea.
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Tim Laman / Golden-bellied crested mona (Cercopithecus pogonias pogonias) male, sitting in tree in the upper caldera, Bioko Island, Equatorial Guinea.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group entering the water, sliding on their bellies, Atka Bay, Antarctica, April.
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Stefan Christmann / Large group of Emperor penguins (Aptenodytes forsteri) entering the water, sliding on their bellies, Atka Bay, Antarctica, April.
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group entering and jumping out of the water, sliding on their bellies, Atka Bay, Antarctica, April.
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Stefan Christmann / Female Emperor penguins (Aptenodytes forsteri) leaving colony, sliding on bellies and walking towards a distant tabular iceberg, Atka Bay, Antarctica, June.