Solvin Zankl / Army ant (Dorylus sp.) close-up of male. Specimen photographed using digital focus stacking

Solvin Zankl / Fire Ant (Solenopsis geminata) head of a major worker with mandibles used for opening seeds. Specimen photographed using digital focus stacking

Jeff Rotman / Nostril and mouth parts of Bamboo shark (Chiloscyllium punctatum) Perth, Australia, Indian Ocean

Steve Downer / Close-up larva of Fruit fly (Drosophila melanogaster) showing mouth parts. UK

Alex Mustard / High magnification photo of Nudibranch (Nembrotha kubaryana), showing orange mouth parts and sensory rhinophores, and green gills (out of focus) Bitung, North Sulawesi, Indonesia. Lembeh Strait, Moluc...

Eric Baccega / Male stag beetle (Lucanus cervus), close-up on mouth parts and antennae, Alsace, France, May

Eric Baccega / Male stag beetle (Lucanus cervus), close-up on mouth parts and antennae, Alsace, France, May

Claudio Contreras / Mountain lion (Puma concolor) yawning, captive.

Franco Banfi / Spectacled caiman (Caiman crocodilus) watched by tourist on bridge, Rio Bai­a Bonita, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Broad-snouted Caiman (Caiman latirostris) Baia Bonita, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Spectacled caiman (Caiman crocodilus) Rio Bai­a Bonita, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Broad-snouted Caiman (Caiman latirostris) Baia Bonita, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Spectacled caiman (Caiman crocodilus) Rio Bai­a Bonita, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Green anaconda (Eunectes murinus) close up underwater in Formoso River, Bonito, Mato Grosso do Sul, Brazil

Michael Durham / Pacific Lamprey (Petromyzon tridentatus) juvenile using sucker-like mouth parts to attach itself to rock, Columbia River Research Laboratory, Willard, Washington

Michael Durham / Pacific Lamprey (Petromyzon tridentatus) juvenile using sucker-like mouth parts to attach itself to glass of aquarium, Columbia River Research Laboratory, Willard, Washington

Martin Dohrn / Bullet ant (Paraponera clavata) portrait showing mandibles, from South America

Jan Hamrsky / Spike-tail Dragonfly (Cordulegaster) nymph portrait showing fearsome mouth parts. Europe, August.

Jan Hamrsky / Great Diving Beetle (Dytiscus marginalis) larva with open mouth parts. Europe, June.

Jan Hamrsky / Northern Emerald Dragonfly (Somatochlora arctica) nymph close-up showing mouth parts. Europe, May.

Jan Hamrsky / Northern Emerald Dragonfly (Somatochlora arctica) nymph, ventral view showing mouth parts. Europe, May.

Alex Hyde / Wartlet / Gem Anemone (Bunodactis verrucosa) in rockpool, with mouth parts visible, Pembrokeshire, Wales, UK. July.

Steven David Miller / Badge Huntsman spider (Neosparassus) sitting on tree trunk, detail of eyes, palps, mouth parts, Undara Volcanic National Park, North Queensland, Australia

Jeff Rotman / Nostrils and mouth parts of Port Jackson shark (Heterodontus philippi) at night, South Australia, Great Australian Bight

Philippe Clement / Close-up of male stag beetle's mouth parts and antennae {Lucanus cervus} France.

Heidi & Hans-Juergen Koch / Blue Bottle Fly (Calliphora erythrocephala) feeding on Kiwi fruit showing compound eyes and mouth parts, worldwide distribution

Heidi & Hans-Juergen Koch / Blue Bottle Fly (Calliphora erythrocephala) close-up portrait showing compound eyes and mouth parts, worldwide distribution

Anup Shah / Sloth bear head close-up - nostrils can be closed and mouth parts are adapted to suck up termites. Native to India.

Michael Hutchinson / Female Wolf spider (Pardosa) moving its mouth parts, Bristol, England, UK, May.

Nick Upton / Close-up of a Shore crab (Carcinus maenas) in a rock pool, moving mouth parts, Gower Peninsula, Glamorgan, Wales, UK, August.