Thomas Mangelsen / White Ibis (Eudocimus albus) trio feeding at sunset, Ding Darling National Wildlife Refuge, Sanibel Island, Florida

Jim Brandenburg / Snowy Egret (Egretta thula) flying over water, Ding Darling National Wildlife Refuge, Florida

Jim Brandenburg / Snowy Egret (Egretta thula) flying, Ding Darling National Wildlife Refuge, Sanibel Island, Florida

George Sanker / American White Pelican (Pelecanus erythrorhynchos) group preening whilst Snowy Egret (Egretta thula) takes off, Ding Darling National Wildlife Refuge, Sanibel Island, Florida, USA.

George Sanker / Reddish Egret (Egretta rufescens) wading portrait, Ding Darling National Wildlife Refuge, Florida, USA.

George Sanker / Sandhill Crane (Grus canadensis) Ding Darling National Wildlife Refuge, Sanibel Island, Florida, USA.

George Sanker / Yellow-crowned night heron (Nyctanassa violacea) in mangrove swamp. Ding Darling National Wildlife Refuge, Florida, USA, March.

Guy Edwardes / Head of Florida Softshell Turtle (Apalone ferox) Ding Darling National Wildlife Refuge, Sanibel Island, Florida, USA

Jerry Monkman / Red-shouldered hawk {Buteo lineatus} Ding Darling National Wildlife Refuge, Sanibel Island, Florida, USA

Jerry Monkman / Shorebirds and wading birds silhouetted against the colours of sunset, Ding Darling National Wildlife Refuge, Sanibel Island, Florida, USA

Scott Leslie / Red-shouldered Hawk (Buteo lineatus), Ding Darling National Wildlife Refuge, Florida

Rolf Nussbaumer / Great Egret (Ardea alba) perched on root of Manrove tree, Ding Darling National Wildlife Refuge, Sanibel Island, Florida, USA, Devember 1998