Barrie Britton / Red-headed vultures (Sarcogyps calvus) and White-rumped vultures (Gyps bengalensis) and Slender-billed vultures (Gyps tenuirostris). Preah Vihear Protected Forest, Cambodia. Take on location for BBC '...

Barrie Britton / Red-headed vulture (Sarcogyps calvus) and Slender-billed vultures (Gyps tenuirostris) at cow carcass. Preah Vihear Protected Forest, Cambodia. Taken on location on location for BBC 'Lands of the Monso...

Ashish & Shanthi Chandola / Red-headed Vulture (Aegypius calvus) perched, Bandipur Tiger Reserve, Karnataka, India, July. Critically endangered species

Dave Watts / King vulture (Sarcogyps calvus) just outside Chitwan National Park, Nepal

Oriol Alamany / Red-headed vulture (Sarcogyps calvus) in flight, Ranthambhore National Park, Rajasthan, India. Critically endangered.