Michael Hutchinson / Close-up of a pair of Marsh fritillary butterflies (Euphydryas aurinia) mating, showing tips of abdomens, Devon, England, UK, June.
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Alex Hyde / Green Dock Beetle (Gastrophysa viridula) female with huge abdomen swollen with eggs. Peak District National Park, Derbyshire, UK. May.
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Konrad Wothe / Red Wood Ant (Formica rufa) colony reacting in defensive behavior by spraying formic acid from a gland in rear of their abdomens, Sweden
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Michael Hutchinson / Close-up of a pair of Marsh fritillary butterflies (Euphydryas aurinia) mating, showing tips of abdomens, Devon, England, UK, June.
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Nick Upton / Mosquito larvae (Culicidae), filter feeding in a garden pond with the breathing tubes at the ends of their abdomens reaching the surface, Wiltshire, UK, June.
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Stephen Dalton / Silver washed fritillary (Argynnis paphia) in flight, Sussex, England, UK, July.
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Eric Baccega / Toposa tribe man with skin scarifications on his belly describing a hunt, Omo Valley, Ethiopia, March 2015.
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Stephen Dalton / Close up of Orb Weaver Spider (Tetragnathidae) abdomen showing spinnerets and thread being controlled by legs. UK.
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Nick Upton / Worker Honey ants with abdomens swollen with honey {Myrmecocystus mimicus} USA
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Nick Upton / Worker Honey ants with abdomens swollen with honey {Myrmecocystus mimicus} USA
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Mark Moffett / Tarantula (Pseudotheraphosa sp) surrounded by a cloud of barbed toxic hairs which it breaks off by brushing their abdomens with hind legs as a defensive move, Venezuela
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Joel Sartore / Photo Ark / Ornate spiny-tailed agama (Uromastyx ornata) portrait, abdomen showing skin markings, Arabia's Wildlife Centre, Sharjah, UAE. Captive.