"Egglab" tries to recapitulate the evolution of crypsis in nightjar eggs by asking the public to act as predators and play "spot the egg" in photos of places where these ground-nesting birds might lay their clutches.
The standard-wing nightjar (Macrodipteryx longipennis), which nests in a belt extending from Senegal in the west to Kenya in the east along the equatorial forest, migrates northward to avoid the wet season.
The pennant-wing nightjar (Cosmetornis vexillarius), in contrast, nests in the Southern Hemisphere south of the Congo forests during the austral, or Southern Hemisphere, summer, then starts north with the onset of the rainy season.
Subsequent laboratory experiments have shown that several species of nightjar have the ability to relax into a torpid state under abnormal conditions.
Its mien is rather hawklike, but its crouching stance, unique in some ways, is more like that of a nightjar.
There is now a tendency to replace the name goatsucker with the more appropriate term nightjar, derived from the birds' voices.
Some populations of the common nighthawk (Chordeiles minor) of North America and the European nightjar (Caprimulgus europaeus) migrate south to Argentina and South Africa, respectively.
The only known instances of apparently regular, prolonged annual hibernation in these birds, however, are reported for the poorwill Phalaenoptilus nuttallii, a nightjar.
Several new species were described in 1995, including a mountain goat (Pseudonovibos spiralis) from Vietnam, a nightjar (Caprimulgus solala) from Ethiopia, a nighthawk (Chordelies vielliardi) from Brazil, and a pygmy owl (Glaucidum parkeri) from Ecuador.
Other birds seen, besides woodlark, nightjar and Dartford warbler, include hobby, merlin, peregrine and short-eared owl.
