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