Luis Quinta / Short toed eagle {Circaetus gallicus} brings snake to chicks in nest, Portugal

Suzi Eszterhas / Crested Serpent eagle (Spilornis cheela) roosting at night, Danum Valley Conservation Area, Sabah, Borneo, Malaysia *Digitally removed twig in background

Andrew Parkinson / Crested Serpent Eagle (Spilornis cheela) adult with crest erect. Bandhavgarh National Park, India.

Mary McDonald / Crested serpent eagle (Spilornis cheela) eating a snake in tree, Bandhavgarh National Park, Madhya Pradesh, India

Mary McDonald / Crested serpent eagle (Spilornis cheela) perched in tree, Bandhavgarh National Park, Madhya Pradesh, India, March

David Noton / Crested serpent eagle (Spilornis cheela) in tree, Wilpattu National Park, Sri Lanka

Charlie Summers / Black-chested Snake Eagle (Circaetus pectoralis) in flight with snake in beak. Ngorongoro Crater, Tanzania.

Charlie Summers / Black-chested snake eagle (Circaetus pectoralis) in flight with snake in beak. Ngorongoro Crater, Tanzania.

Bernard Castelein / Crested serpent eagle (Spilornis cheela), Keoladeo Ghana NP, Bharatpur, Rajasthan, India

David Woodfall / Crested serpent eagle (Spilornis cheela) perched in rain, India

David Woodfall / Crested serpent eagle (Spilornis cheela) perched in rain, India

Bernard Castelein / Crested serpent eagle {Spilornis cheela} perched, calling, Kaziranga NP, Assam, India

Charlie Summers / Black-chested Snake Eagle (Circaetus pectoralis) taking off, Ndutu, Ngorongoro Conservation Area, Tanzania, East Africa

David Woodfall / Crested serpent eagle (Spilornis cheela) feeding on young Peacock chick which it has killed, Sal forest, Bandhavgah NP, Madhya Pradesh, India

David Woodfall / Crested serpent eagle (Spilornis cheela) perched in tree feeding on young Peacock which it has killed, Sal forest, Bandhavgah NP, Madhya Pradesh, India

David Woodfall / Crested serpent eagle (Spilornis cheela) feeding on young Peacock which it has killed Sal forest, Bandhavgarh NP, Madhya Pradesh, India, November 2008

David Woodfall / Crested serpent eagle (Spilornis cheela) feeding on young Peacock which it has killed Sal forest, Bandhavgarh NP, Madhya Pradesh, India, November 2008

David Woodfall / Crested serpent eagle (Spilornis cheela) Sal forest, Bandhavgarh NP, Madhya Pradesh, India, November

David Woodfall / Crested serpent eagle (Spilornis cheela) feeding on young Peacock which it has killed Sal forest, Bandhavgarh NP, Madhya Pradesh, India

David Woodfall / Crested serpent eagle (Spilornis cheela) feeding on young Peacock which it has killed Sal forest, Bandhavgarh NP, Madhya Pradesh, India

Anup Shah / Black-chested snake eagle (Circaetus pectoralis)perching on a branch . Masai Mara National Reserve, Kenya. March

Tim Laman / Crested Serpent Eagle (Spilornis cheela) perched along the side of a mangrove channel, Sundarban Forest, Khulna Province, Bangladesh.

Tim Laman / Crested Serpent Eagle (Spilornis cheela) perched along the side of a mangrove channel, Sundarban Forest, Khulna Province, Bangladesh.

Tim Laman / Crested Serpent Eagle (Spilornis cheela) perched along the side of a mangrove channel, Sundarban Forest, Khulna Province, Bangladesh.

Tim Laman / Crested Serpent Eagle (Spilornis cheela) perched along the side of a mangrove channel, Sundarban Forest, Khulna Province, Bangladesh.

Piper Mackay / Brown snake eagle (Circaetus cinereus) killing a Cobra, Lake Nakuru NP, Kenya

Luis Quinta / Short toed eagles {Circaetus gallicus} bring snake to chick in nest, Portugal

Luis Quinta / Short toed eagle {Circaetus gallicus} chick feeding on snake in nest, Portugal

Tony Heald / Crested Serpent Eagle [Spilornis cheela] two perched, Bandhavgarh NP, Madhya Pradesh, India, March

Pete Oxford / Crested Serpent Eagle (Spilornis cheela) Bharatpur / Keoladeo Ghana Sanctuary. Rajasthan. India

Bernard Castelein / Crested Serpent Eagle (Spilornis cheela) perched in tree head turned looking backwards, Keoladeo Ghana NP, Bharatpur, Rajasthan, India

Tony Heald / Crested serpent eagle {Spilornis cheela} calling, Bandhavgarh National Park, India 2007

Tony Heald / Crested serpent eagle {Spilornis cheela} feeding on snake, Bandhavgarh National Park, India 2007

Tony Heald / Crested serpent eagle {Spilornis cheela} Bandhavgarh National Park, India 2007

Peter Blackwell / Black breasted snake eagle {Circaetus pectoralis} Masai Mara, Kenya

E.A. KUTTAPAN / Crested serpent eagle portrait {Spilornis cheela}, Bandhavgarh NP, Madhya Pradesh, India

Bernard Castelein / Crested Serpent Eagle (Spilornis cheela) Ranthambore NP, India

Bernard Castelein / Crested serpent eagle (Spilornis cheela) with snake prey, Ranthambore NP. Rajasthan. India

Tony Heald / Black-chested snake eagle (Circaetus pectoralis) Kaokoland, Namibia

Tony Heald / Black-chested snake eagle (Circaetus pectoralis) Kaokoland, Namibia

Chris Gomersall / Crested serpent eagle {Spilornis cheela} Bandhavgarh, India.

Nick Upton / Crested serpent eagle {Spilornis cheela} portrait, Taiwan

Nick Upton / Crested serpent eagle calling {Spilornis cheela} Taiwan

E.A. KUTTAPAN / Crested serpent eagle portrait {Spilornis cheela} Bandhavgarh NP Madhya Pradesh India

Pete Oxford / Crested eagle juvenile feeding at nest {Morphnus guianensis} Puerto Maldonado Amazonia Peru

E.A. KUTTAPAN / Crested serpent eagle portrait {Spilornis cheela} Bandhavgarh NP Madhya Pradesh India

Bernard Castelein / Crested serpent eagle calling {Spilornis cheela} Kaziranga NP Assam India