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

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

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

Jan Hamrsky / Darner Dragonfly (Aeshna) nymph extending its specialised mouthparts. Europe, August.

Edwin Giesbers / Nile crocodile {Crocodylus niloticus} close up of eye, mouth and skin, captive, from Africa

Brent Hedges / Great white shark at surface {Carcharodon carcharias} South Australia

Jeff Rotman / Close up of teeth of Sand Tiger shark {Carcharias taurus} New South Wales, Australia.

Michael Pitts / Tiger shark {Galeocerdo cuvieri} South Africa, Atlantic.

Jeff Rotman / Sand tiger shark at night (Carcharias taurus)