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C. a. aequabilis Sri Lanka. Jerdon's nightjar (Caprimulgus atripennis) is a medium-sized nightjar species native to southern India and Sri Lanka.Formerly considered as a subspecies of the long-tailed nightjar, it is best recognized by its distinctive call which sounds like a wooden plank being beaten periodically with each note ending in a quaver. [2]
There are many birds that are active nocturnally. Some, like owls and nighthawks, are predominantly nocturnal whereas others do specific tasks, like migrating, nocturnally. North Island brown kiwi, Apteryx mantelli [1] Black-crowned night heron, Nycticorax nycticorax [1] Short-eared owl, Asio flammeus [1] Long-eared owl, Asio otus [1]
The hunt ends as dusk becomes night, and resumes when night becomes dawn. [13] Nighttime feeding (in complete darkness) is rare, [ 4 ] even on evenings with a full moon. [ 13 ] The bird displays opportunistic feeding tendencies, although it may be able to fine-tune its meal choice in the moments before capture.
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The level of divergence is the highest of any genus of birds, being more typical of the divergence between genera or even families. The northern potoo was for a long time considered to be the same species as the common potoo , but the two species have now been separated on the basis of their calls .
The tail is dark with white barring; the underparts are white with black bars. The adult male has a white throat; the female has a light brown throat. The most distinguishing characteristic to determine its identity from its closest relative the common nighthawk are the contrasting pale tertials near the back of the wings of a sitting bird ...
The bird usually maintains a quiet demeanor, and it is quite rare to encounter its distinctive whines or trilling calls outside of its breeding grounds. [7] Its toadlike trills can be sung in sequences lasting 7–13 seconds and can extend to over 3 minutes.
Like other nightjars they are nocturnal, active at dusk and at night. [8] They have a distinctive call which includes a sharp tsiik followed by a pause and a two-syllable ba-haaww . Painting by Elizabeth Gwillim c. 1801