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.

Karine Aigner / Pauraque (Nyctidromus albicollis) with chick on nest. Texas, USA. June.

Karine Aigner / Pauraque (Nyctidromus albicollis) two chicks in nest. Texas, USA. June.

Karine Aigner / Pauraque (Nyctidromus albicollis) two chicks in nest. Texas, USA. June.

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

Ernie Janes / Dusky nightjar (Antrostomus saturatus) Costa Rica.

Ernie Janes / Dusky nightjar (Antrostomus saturatus) Costa Rica.

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.

Eric Medard / Nightjar (Caprimulgus europaeus) in flight at sunset, France. June.

Eric Medard / Nightjar (Caprimulgus europaeus) in flight at sunset, France. June.

Eric Medard / Nightjar (Caprimulgus europaeus) resting during the day, France. June.

Eric Medard / Nightjar (Caprimulgus europaeus) at night, taken with infra red camera. France. June.

Andres M. Dominguez / Red-necked nightjar (Caprimulgus ruficollis) on nest with eggs, Arcos de la Frontera, southern Spain, May

Matthew Maran / Isolated Scots pines (Pinus sylvestris) on the East Devon Pebblebed Heaths which provides popular churring / calling locations for the nightjar (Caprimulgus europaeus) Devon, England, UK, May 2014.

Barry Mansell / Whip-poor-will (Caprimulgus vociferus) female on nest, North Florida,USA

Jussi Murtosaari / Nightjar (Caprimulgus europaeus) resting, Finland, May.

Bernard Castelein / Ladder-tailed nightjar (Hydropsalis climacocerca) Madidi National Park, Bolivia

Hanne & Jens Eriksen / Jungle nightjar (Caprimulgus indicus) on branch, India, January.

Hanne & Jens Eriksen / European nightjar (Caprimulgus europaeus) at rest on boat at sea, during autumn migration, Oman, October.

Juan Carlos Munoz / Pauraque (Nyctidromus albicollis) in leaf litter, Pantanal, Brazil.

Jiri Lochman / Spotted Nightjar (Eurostopodus argus), nesting on the ground, native to mainland Australian, New Guinea and surrounding islands.

Jiri Lochman / Large-tailed Nightjar (Caprimulgus macrurus) nesting amongst dry leaves on forest floor, native to the Northern Territory and northern and eastern Queensland, Australia.

Markus Varesvuo / Nightjar (Caprimulgus europaeus) nesting on ground, Hungary May

Doug Wechsler / Common pauraque (Nyctidromus albicollis) nest on ground with single egg, Province Loja, Jorupe Biological Reserve, Ecuador, January

Gerrit Vyn / Common Nighthawk (Chordeiles minor). Central Idaho. June.

David Tipling / European nightjar (Caprimulgus europaeus) male hawking after a moth, Norfolk, UK July

Hanne & Jens Eriksen / European nightjar (Caprimulgus europaeus) on tree trunk, Oman, April

Hanne & Jens Eriksen / European nightjar (Caprimulgus europaeus) in flight over the sea, during migration, Oman, September

Hanne & Jens Eriksen / European nightjar (Caprimulgus europaeus) in flight over the sea, during migration, Oman, September

Eric Baccega / Nightjar (Caprimulgus europaeus) female on nest. Virunga National Park, North Kivu, Democratic Republic of Congo, Africa

Hanne & Jens Eriksen / European nightjar (Caprimulgus europaeus) in flight over the sea, Oman, October

Hanne & Jens Eriksen / European nightjar (Caprimulgus europaeus) in flight over the sea, Oman, October

Suzi Eszterhas / Madagascar nightjar (Caprimulgus madagascariensis) Berenty Private Reserve, Madagascar.

Bernard Castelein / Madagascar nightjar (Caprimulgus madagascariensis) perching on tree at night, Reniala Forest, Mangily, Madagascar

Bernard Castelein / Madagascar nightjar (Caprimulgus madagascariensis) perching on tree at night, Reniala Forest, Mangily, Madagascar

Bernard Castelein / Madagascar nightjar (Caprimulgus madagascariensis) at night, Reniala Forest, Mangily, Madagascar

Bernard Castelein / Madagascar Nightjar (Caprimulgus madagascariensis) on ground nest, Reniala Forest, Mangily, Madagascar

Jussi Murtosaari / European nightjar (Caprimulgus europaeus) resting during day, Uto, Finland, May.

Jussi Murtosaari / European nightjar (Caprimulgus europaeus) resting during day, Uto, Finland, May.

Andres M. Dominguez / Red-necked nightjar (Caprimulgus ruficollis) with chicks at nest, Arcos de la Frontera, southern Spain, June

Wim van den Heever / Square-tailed nightjar (Caprimulgus fossii) at night. Okavango Delta, Botswana.

Gerrit Vyn / Common nighthawk (Chordeiles minor) male roosting in the rain on a fence. Sublette County, Wyoming, USA. June.

Gerrit Vyn / Common nighthawk (Chordeiles minor) female roosting on a fence post. Sublette County, Wyoming, USA. June.

Eric Medard / Nightjar (Caprimulgus europaeus) in flight, taken at night with infra-red remote camera trap, France, June.

Suzi Eszterhas / Jungle night-jar (Caprimulgus indicus) Satpura National Park, India.

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

Bernard Castelein / Collared nightjar (Caprimulgus enarratus ) resting on the ground, Andasibe-Mantadia National Park, Madagascar.

David Tipling / 2020VISION / Eurasian nightjar (Caprimulgus europaeus) perched on a broken branch, churring, Norfolk, England, UK, June. Sequence 2/2

David Tipling / 2020VISION / Eurasian nightjar (Caprimulgus europaeus) landing on a broken branch, churring, Norfolk, England, UK, June. Sequence 1/2.

Hanne & Jens Eriksen / European nightjar (Caprimulgus europaeus) in flight over the ocean, during autumn migration, Oman, October.

Kim Taylor / White-tailed nightjar (Caprimulgus cayennensis) resting during daylight. Tobago, West Indies.

Enrique Lopez-Tapia / Collared nightjar (Caprimulgus enarratus) Andasibe-Mantadia National Park, Madagascar.

Enrique Lopez-Tapia / Collared nightjar (Caprimulgus enarratus) Andasibe-Mantadia National Park, Madagascar.

Robin Chittenden / Nightjar (Caprimulgus eurpaeus meridionalis) on branch, Lesbos Greece, May.

Eric Medard / Nightjar (Caprimulgus europaeus) taken at night with infra-red remote camera trap, Mayenne, France, June.

Eric Medard / Nightjar (Caprimulgus europaeus) perched on post, taken at night with infra-red remote camera trap, Mayenne, France, June.

Eric Medard / Nightjar (Caprimulgus europaeus) taken at night with infra-red remote camera trap, Mayenne, France, June.

Eric Medard / Nightjar (Caprimulgus europaeus) flying, taken at night with infra-red remote camera trap, Mayenne, France, June.

Eric Medard / Nightjar (Caprimulgus europaeus) in flight, taken at night with infra-red remote camera trap, France, July 2014.

Eric Medard / Nightjar (Caprimulgus europaeus) flying, taken at night with infra-red remote camera trap, Mayenne, France, June.

David Tipling / European Nightjar (Caprimulgus europaeus) male on song perch, Norfolk, England, UK. July.

David Tipling / European Nightjar (Caprimulgus europaeus) male on song perch, Norfolk, England, UK. July.

Roland Seitre / Red-necked Nightjar (Caprimulgus ruficollis) resting on ground, Missour, Fes-Boulemane, Morocco.

Hanne & Jens Eriksen / European nightjar (Caprimulgus europaeus) resting on branch, Oman, May

Nick Garbutt / Collared Nightjar (Caprimulgus enarratus) resting on leaf-litter beneath a Pandanus tree. Andasibe-Mantadia National Park, eastern Madagascar.

David Tipling / Hand coloured etching plate of Nightjar / Goat sucker (Caprimulgus) feeding on Mole Cricket (Gryllotalpidae) from The Natural History of Carolina, Florida and the Bahama islands (1731-43) Vol. 1 by Ma...

Jussi Murtosaari / Nightjar (Caprimulgus europaeus) on the ground, southern Finland, May.

Robin Chittenden / White-tailed Nightjar (Caprimulgus cayennensis leopetes) on rotting log, Trinidad, Trinidad and Tobago

Konrad Wothe / Madagascar Nightjars (Caprimulgus madagascariensis) perched on branch, Andasibe Mantadia National Park, Madagascar, Africa

Bernard Castelein / Madagascar Nightjar (Caprimulgus madagascariensis) Toliare, Madagascar

Laurent Geslin / Nightjar {Caprimulgus europaeus} with chick under wing, Brittany, France

Laurent Geslin / Nightjar {Caprimulgus europaeus} female camouflaged on nest with chick, France

Laurent Geslin / Nightjar {Caprimulgus europaeus} sitting on the ground, UK.

Laurent Geslin / Nightjar female on nest {Caprimulgus europaeus} Brittany, France

David Tipling / Swallow-tailed Nightjar (Uropsalis segmentata) male roosting during day, Ecuador

David Tipling / Feline Owlet-Nightjar (Aegotheles insignis) in tree hole, Tari, Southern Highlands, Papua New Guinea

David Tipling / Barred Owlet-Nightjar (Aegotheles bennettii) poking head out of roost tree, Varirata NP, Papua New Guinea

David Tipling / Nightjar (Caprimulgus europaeus) had been shot illegally by hunter but was fit enough to be released, BirdLife Malta Springwatch Camp, Malta, April 2013

David Tipling / Nightjar (Caprimulgus europaeus) had been shot illegally by hunter but was fit enough to be released, BirdLife Malta Springwatch Camp, Malta, April 2013

David Tipling / Nightjar (Caprimulgus europaeus) illegally shot, Malta next to gun cartridge, during BirdLife Malta Springwatch Camp, Malta, April 2013

David Tipling / Nightjar (Caprimulgus europaeus) illegally shot, Malta, during BirdLife Malta Springwatch Camp, Malta, April 2013

David Tipling / Nightjar (Caprimulgus europaeus) illegally shot, Malta, during BirdLife Malta Springwatch Camp, Malta, April 2013

David Tipling / Nightjar (Caprimulgus europaeus) shot in wing and put down by vet, Birdlife Malta Springwatch Camp, Malta, April 2013

David Tipling / Nightjar (Caprimulgus europaeus) shot in wing and put down by vet, Birdlife Malta Springwatch Camp, Malta, April 2013

Sven Zacek / Nightjar (Caprimulgus europaeus). Hiiumaa Island, Estonia, Europe, August.

Andy Sands / Nightjar (Caprimulgus europaeus) female camouflaged on nest. West Sussex, UK, July.

Andy Sands / Nightjar (Caprimulgus europaeus) female camouflaged on nest. West Sussex, UK, July.