Neil Lucas / Head portrait Blyth's hawk eagle (Nisaetus alboniger) Singapore Captive Jurong Bird

Lucas Bustamante / Crested hawk-eagle (Nisaetus cirrhatus) Yala National Park, Southern Province, Sri Lanka

Robin Chittenden / Crested hawk-eagle (Spizaetus cirrhatus ceylanensis) perched, Sri Lanka.

Robin Chittenden / Crested hawk-eagle (Spizaetus cirrhatus ceylanensis) perched, Sri Lanka.

Lucas Bustamante / Crested hawk eagle (Nisaetus cirrhatus) perched, Yala National Park, Southern Province, Sri Lanka.

Hanne & Jens Eriksen / Crested hawk eagle (Nisaetus cirrhatus) perched in tree, India, January.

Bernard Castelein / Changeable hawk eagle (Spizaetus cirrhatus), Kaziranga National Park, Assam, India.

Bernard Castelein / Changeable hawk eagle (Spizaetus cirrhatus), Kaziranga National Park, Assam, India.

Ernie Janes / Crested hawk eagle (Nisaetus cirrhatus) immature, Sri Lanka

Ernie Janes / Crested hawk eagle (Nisaetus cirrhatus) immature, Sri Lanka

Laurent Geslin / Juvenile Crested / Changeable hawk eagle (Nisaetus cirrhatus) Kahna NP, India

Loic Poidevin / Crested / Changeable hawk eagle (Spizaetus / Nisaetus cirrhatus) Kaziranga National Park, Assam, India

Kevin Schafer / Crested / Changeable Hawk Eagle (Nisaetus cirrhatus) perched on dead log. Yala National Park, Sri Lanka.

Pete Oxford / Crested / Changeable Hawk-Eagle (Nisaetus cirrhatus) Gir Forest National Park. Gujarat, India.

Pete Oxford / Crested / Changeable Hawk-Eagle (Nisaetus cirrhatus) Gir Forest National Park. Gujarat, India.

Nick Garbutt / Changeable / Crested hawk eagle {Nisaetus cirrhatus} plucking feathers from its dead prey (possibly a White-eyed Buzzard). Bandhavgarh National Park, Madhya Pradesh, India.

Nick Garbutt / Blythe's hawk eagle {Nisaetus alboniger} from Malaysia

DAVID TIPLING / Crested / Changeable hawk eagle at water {Nisaetus cirrhatus} North India

E.A. KUTTAPAN / Crested hawk eagle {Nisaetus cirrhatus} Bandhavgarh NP, India.

Neil Lucas / Camerman Mike Richards with Blythe's Hawk Eagle {Nisaetus alboniger}, on location for BBC programme 'Wildlife on One Special' 'Eagle', Malaysia, 1997

Nature Production / Mountain Hawk-eagle flying {Nisaetus nipalensis} Kochi, Japan, march

Nature Production / Mountain Hawk-eagle flying {Nisaetus nipalensis} Kochi, Japan, march

Kristel Richard / Crested hawk eagle (Nisaetus cirrhatus) juvenile perched on a branch, Pench National Park, Madya Pradesh, India.

Roland Seitre / Philippine hawk-eagle (Nisaetus philippensis) head portrait, Philippines. Captive.

Roland Seitre / Philippine hawk-eagle (Nisaetus philippensis) portrait, Philippines. Captive.

Karine Aigner / Changeable hawk-eagle / Crested hawk-eagle (Nisaetus cirrhatus) perched on branch, Bardia National Park, Terai, Nepal.

Karine Aigner / Changeable hawk-eagle / Crested hawk-eagle (Nisaetus cirrhatus) perched on branch in mist, Bardia National Park, Terai, Nepal.

Joel Sartore / Photo Ark / Philippine hawk eagle (Nisaetus philippensis) close up of head looking around, Eltoro Zoo, Philippines. Captive.

Ben Cranke / Blyth's hawk-eagle (Nisaetus alboniger) Sabah, Malaysian Borneo