Doug Perrine / Bryde's whale {Balaenoptera brydei / edeni} with throat pleats expanded after feeding on baitball of Sardines {Sardinops sagax} off Baja California, Mexico, Eastern Pacific Ocean. Veolia Environnement...

Robert Valentic / Eastern tiger snake (Notechis scutatus) female, Yarra River corridor in suburban Melbourne, Victoria, Australia, in mid-summer. She is in a defensive pre-strike position with hood expanded, accompanie...

Doug Perrine / Bryde's whale (Balaenoptera brydei / edeni) with throat pleats expanded after engulfing part of a school of Sardines, off Baja California, Mexico (Eastern Pacific Ocean)

Tim MacMillan / John Downer Pr / Kuhl's gecko flying - every edge of body expanded into membrane that acts as a wing as it glides (Resolution restriction - image digitised from film, 'Weird Nature' tv series)

Edwin Giesbers / Spiny flower mantis (Pseudocreobotra wahlbergii) with wings expanded, captive, occurs in Africa.

Tui De Roy / Brown pelicans (Pelecanus occidentalis) feeding underwater, with throat pouch expanded, Galapagos

Kim Taylor / Brimstone butterfly (Gonepteryx rhamni) with wings almost fully expanded after after emerging from pupa, Surrey, England, July. Sequence 8 of 8.

Wim van den Heever / Zebra (Equus quagga) leaping during stampede, Serengeti, Tanzania. Vignette added and right edge expanded.

Tui De Roy / Brown pelicans (Pelecanus occidentalis) feeding underwater, with throat pouch expanded, Galapagos

Daniel Heuclin / Egyptian cobra (Naja haje) with head raised up and hood expanded, near Taroudant, Morocco.

Daniel Heuclin / Egyptian cobra (Naja haje) with head raised up and hood expanded, Morocco.

Daniel Heuclin / Egyptian cobra (Naja haje) with head raised up and hood expanded, near Ouarzazate, Morocco.