Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a catfish (Loricariidae) with Cocoi heron (Ardea cocoi) scavenging remnants, Rio Cuiaba, Brazil

Bence Mate / Great white egret (Ardea alba) group of three in winter, Kiskunsag National Park, Hungary. Winner of the Bird Category of Nature Photographer of the Year Awards 2018.

Jan Wegener/ BIA / Grey Heron (Ardea cinerea) spreading wings on frozen lake, Berlin, Germany

Loic Poidevin / Purple heron (Ardea purpurea) in flight, Brenne, France, May

Ingo Arndt / Purple Heron (Ardea purpurea) pair courting and building nest in reeds, Germany

Steve Gettle / Great Egret (Ardea alba) in courtship display, North America

Yashpal Rathore / Demoiselle crane (Anthropoides virgo) low angle fisheye perspective of feeding cranes. Khichan, Western Rajasthan, India. February, 2015

Yashpal Rathore / Demoiselle crane (Anthropoides virgo) resting on sand dunes during winter migration, Khichan, Western Rajasthan, India. March.

Yashpal Rathore / Demoiselle crane (Anthropoides virgo) low angle view with cloudy sky, Khichan, Western Rajasthan, India. December.

Yashpal Rathore / Demoiselle crane (Anthropoides virgo) low angle view of birds flying and landing near the chugga ghar (bird feeding enclosure ) in Khichan Village, durin their annual migration. Western Rajasthan, Ind...

Yashpal Rathore / Demoiselle cranes (Anthropoides virgo) silhouetted at dusk on a wall during their winter migration.Khichan, Western Rajasthan, India. February.

Yashpal Rathore / Demoiselle cranes (Anthropoides virgo) flying at sunrise during migration. Khichan, Western Rajasthan, India. December.