Common Nighthawk Identification, All About Birds, Cornell Lab of Ornithology

The common nightjar (Caprimulgus europaeus) is a night bird from the family of true nightjars, nesting in Eurasia and in northwestern Africa. A size larger than a thrush.

The savanna nightjar (Caprimulgus affinis) is a species of nightjar found in South and Southeast Asia. Eight subspecies are recognised: C. a. monticolus, C. a. amoyensis, C. a. stictomus, C. a. affinis, C. a. timorensis, C. a. griseatus, C. a. mindanensis and C. a. propinquus. Its habitat is open forest and areas with scrub. Its length is about 25 cm (9.8 in). The upperparts are brownish-grey and vermiculated, with pale brown speckles. The underparts are brown, with bars. The savanna nightjar is

Identification Basics - Songs of Insects