Peter Blackwell / Paradise whydah, Masai Mara, Kenya

Shattil & Rozinski / Greater prairie chicken {Tympanuchus cupido} male displaying, Colorado, USA

Shattil & Rozinski / Greater prairie chicken {Tympanuchus cupido} male courtship with female, Colorado, USA

TJ Rich / Southern Ground hornbill feeding (Bucorvus leadbeateri) Masai Mara National Reserve, Kenya

TJ Rich / Ostrich Male (Struthio camelus) Masai Mara National Reserve, Kenya

Shattil & Rozinski / Lesser prairie chicken {Tympanuchus pallidicintus} male displaying at lek, Colorado, USA

Shattil & Rozinski / Lesser prairie chicken {Tympanuchus pallidicintus} male displaying at lek, Colorado, USA

Bernard Castelein / Steppe eagle {Aquila rapax nipalensis} Rajasthan, India.

John Cancalosi / Kori bustard (Choriotis kori). Zimbabwe, Southern Africa

Bernard Castelein / Hooded vulture feeding. (Necrosyrtes monachus) Tanzania Senengeti NP

Tom Vezo / Prairie falcon with prey {Falco mexicanus} C Tucson Arizona US

Tom Vezo / Prairie falcon with prey {Falco mexicanus} C Tucson Arizona US

Tom Vezo / Prairie falcon {Falco mexicanus} C Arizona USA at banding station Sulphur springs

Tom Vezo / Prairie falcon with prey {Falco mexicanus} C Tucson Arizona US