Melvin Grey / Chestnut-bellied sandgrouse (Pterocles exustus olivascens) male. Ndutu, Tanzania.

Melvin Grey / Chestnut-bellied sandgrouse (Pterocles exustus olivascens) pair in flight. Meru National Park, Kenya.

Melvin Grey / Chestnut-bellied sandgrouse (Pterocles exustus olivascens) male soaking feathers to provide chicks at nest with water. Meru National Park, Kenya.

Hanne & Jens Eriksen / Chestnut bellied sandgrouse (Pterocles exustus) flock in flight, Oman, February

Hanne & Jens Eriksen / Chestnut bellied sandgrouse (Pterocles exustus) juvenile feeding, Oman, May

Eric Dragesco / Tibetan Sandgrouse (Syrrhaptes tibetanus) group in flight, ChangThang, Tso Kar Lake, at an altitude of 4600m, Ladakh, India

Eric Dragesco / Tibetan Sandgrouse (Syrrhaptes tibetanus). ChangThang, Tso Kar Lake, at an altitude of 4600m, Ladakh, India

Bernard Castelein / Painted sandgrouse {Pterocles indicus} male amongst scrub, Madhav NP, Madhya Pradesh, India

Joel Sartore / Photo Ark / Chestnut-bellied sandgrouse (Pterocles exustus erlangeri) pair, portrait, Wadi Al Safa Wildlife Center, Dubai. Captive.

Roland Seitre / Chestnut-bellied sandgrouse (Pterocles exustus) flock taking flight, Lac de Guiers, Ferlo, Senegal.

Roland Seitre / Chestnut-bellied sandgrouse (Francolinus erckelii) standing on bare ground, Waikoloa village, Big Island, Hawaii.

Ashish & Shanthi Chandola / Chestnut-bellied sandgrouse ( Pterocles exustus), male, Rajasthan, India.