Chien Lee / Wallace's Flying Frog (Rhacophorus nigropalmatus) showing webbed membranes between toes, Kubah National Park, Malaysia

Chien Lee / Wallace's Flying Frog (Rhacophorus nigropalmatus) showing webbed membranes between toes, Kubah National Park, Malaysia

Tim Laman / Kuhl's flying gecko (Ptychozoon kuhlii) held with gliding membranes spread out, Gunung Palung National Park, Borneo, West Kalimantan, Indonesia

Tim Laman / Flying dragon lizard (Draco sp) captured individual with its gliding membranes or patagium held open, Gunung Palung National Park, Borneo, West Kalimantan, Indonesia

Tim Laman / Flying dragon lizard (Draco sp) captured individual with its gliding membranes or patagium held open. Danum Valley Conservation Area, Sabah, Borneo, Malaysia.

Tim Laman / Flying dragon lizard (Draco sp) captured individual with its gliding membranes or patagium held open. Danum Valley Conservation Area, Sabah, Borneo, Malaysia.

Gerrit Vyn / Little Brown Myotis (Myotis lucifugus) heavily infected by white-nose syndrome hibernating in a mine. This bat is showing white fungus on the wing and tail membranes and the face as well as other infe...

Andrew Parkinson / Giant eagle owl {Bubo lacteus} perched with nictating membranes covering eyes, Kgalagadi Transfrontier NP, South Africa

Jane Burton / British show pony mare giving birth lying down, foal's head is free of the membranes and it takes its first breath, UK, sequence 7/26

Albert Lleal / Dragonfly (Sympetrum sp) SEM close-up of the veins in the membranes of a wing at 35x magnification

Piotr Naskrecki / Giant Helmeted Katydid (Phyllophorella woodfordi) climbing on limb with brown ear membranes visible on forelegs, Solomon Islands

Jane Burton / Domestic Cat, tortoiseshell-and-white female 'Alexandria' cleaning away the membranes of her fourth-born kitten as it waits for its placenta to come away, birth sequence 7/14