Alan Murphy / Buff-collared Nightjar (Caprimulgus ridgwayi) calling, Arizona

Laurent Geslin / Nightjar {Caprimulgus europaeus} with chick on ground, UK.

David Tipling / Nightjar {Caprimulgus europaeus} male in display flight at dusk, North Norfolk, UK, June

David Tipling / Nightjar {Caprimulgus europeaea} male in display flight at night, North Norfolk, UK, June

David Tipling / Nightjar {Caprimulgus europaeus} male churring on song post at dusk, North Norfolk, UK, June

David Tipling / Nightjar {Caprimulgus europaeus} at nest in threat display towards advancing Adder, North Norfolk, UK, May

Mike Wilkes / Nightjar (Caprimulgus europaeus) on nest. England, UK, Europe

David Kjaer / Nightjar on nest, England

Dong Lei / Grey nightjar (Caprimulgus indicus). Simao, Pu'er Prefecture, Yunnan Province, China.

Markus Varesvuo / Egyptian nightjar (Caprimulgus aegyptius), two resting on sand, camouflaged amongst pebbles. Morocco. March.

Staffan Widstrand / Large-tailed nightjar (Caprimulgus macrurus) in Keoladeo Ghana National Park, Bharatpur, Rajasthan, India

Alain Dragesco-Joffe / Egyptian nightjar (Caprimulgus aegyptius) at rest, camouflaged with the soil, Tenere, Sahara, Niger.