Tim Laman / Brolga (Grus rubicundus) and Paperbark trees (Melaleuca sp.) in the lagoon behind the beach at Running Creek. Queensland, Australia.

Jurgen Freund / Timelapse of Brolga cranes (Grus rubicunda) and Sarus cranes (Grus antigone) roosting at a waterhole, Bromfield Swamp, Wet Tropics World Heritage Area, North Queensland, Australia.

Roger Powell / Brolga (Grus rubicundus) feeding on the edge of a field. Werribee Sewerage Works, Werribee, Victoria, Australia

Roger Powell / Two Brolgas (Grus rubicundus) against agricultural background. Werribee Sewerage Works, Werribee, Victoria, Australia

Jurgen Freund / Brolga cranes (Grus rubicunda) in field as it is irrigated, Mareeba, Queensland,Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) one dancing with others in field. Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) one dancing with others in field. Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) one dancing with others in field. Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) two in field. Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) two in field. Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) dancing in field, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) two in field, one dancing, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) two in field. Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) dancing in field. Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas crane (Grus rubicunda) two in flight, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolga cranes (Grus rubicunda) taking off from field with cattle, Bromfield Swamp, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas cranes (Grus rubicunda) two in flight, Bromfield Swamp, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolga cranes (Grus rubicunda) taking off from field with cattle, Bromfield Swamp, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolga cranes (Grus rubicunda) in field, Bromfield Swamp, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolga cranes (Grus rubicunda) in field, Bromfield Swamp, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Brolgas (Grus rubicunda) group flying over field, Bromfield Swamp, Atherton Tablelands, Queensland, Australia.

Jurgen Freund / Caution sign which reads : Slow down Brolgas crossing here, Northern Territory, Australia.

Jurgen Freund / Brolga pair (Grus rubicunda) in open savannah, Northern Territory, Australia.

Jurgen Freund / Brolga crane (Grus rubicunda) adult and juvenile, Muloorina Station, South Australia

Steven David Miller / Brolga cranes (Grus rubicunda) adult and juvenile fishing in wetland, Corroboree Billabong, Mary River, Northern Territory, Australia

Steven David Miller / Brolga crane (Grus rubicunda) fishing in wetland, Corroboree Billabong, Mary River, Northern Territory, Australia

Steven David Miller / Brolga cranes (Grus rubicunda) adults and juvenile fishing in wetland, Corroboree Billabong, Mary River, Northern Territory, Australia

Pete Oxford / Two Brolga cranes (Grus rubicunda) flying. Queensland. Australia

Pete Oxford / Brolga crane (Grus rubicunda) flying. Queensland. Australia

Pete Oxford / Small flock of Brolga cranes (Grus rubicunda) flying. Queensland. Australia

Steven David Miller / Brolga crane (Grus rubicunda) performing courtship dance, in wetlands habitat, Mungerannie, Birdsville Track, South Australia

Steven David Miller / Brolga crane (Grus rubicunda) performing courtship dance, in wetlands habitat, Mungerannie, Birdsville Track, South Australia

Steven David Miller / Brolga cranes (Grus rubicunda) pair performing courtship dance, in wetlands habitat, Mungerannie, Birdsville Track, South Australia

Steven David Miller / Brolga crane (Grus rubicunda) head portrait, wildlife sanctuary, captive. North Queensland, Australia

Dave Watts / Brolga {Grus rubicundus} flock flying in front of setting sun, Queensland, Australia. Composite image.

Pete Oxford / Brolga cranes (Grus rubicunda) flying, Queensland, Australia

Pete Oxford / Brolga cranes (Grus rubicunda) flying, Queensland, Australia

WILLIAM OSBORN / Brolga crane {Grus rubicundus} Queensland, Australia

Dave Watts / Brolga cranes flying across setting sun (Grus rubicunda) Queensland, Australia

Dave Watts / Brolga crane {Grus rubicunda} Yepon, Queensland, Australis

Dave Watts / Brolga crane 'dancing' display {Grus rubicunda} N Queensland, Australia

Steven David Miller / Pet Brolga crane {Grus rubicunda} with owner and tractor. South Australia

Steven David Miller / Brolga crane head portrait(Grus rubicunda) captive, Australia

Theo Allofs / Brolga (Grus rubicunda) crane portrait, Australia

Rob Drummond/ BIA / Brolga (Grus rubicunda) crane, Victoria, Australia

Daniel Venema/ BIA / Brolga (Grus rubicunda), Queensland, Australia

Simon Bennett / Brolga (Grus rubicunda), Queensland, Australia

Martin Willis / Brolga (Grus rubicunda) pair, Hughenden, Queensland, Australia