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How do owlet-frogmouths perch compared with nightjars?
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Caprimulgiform
Male common nightjar (Caprimulgus europaeus) landing
Owlet-frogmouths and nightjars exhibit distinct perching behaviors within the order Caprimulgiformes.
While most true nightjars typically roost on the ground, rocks, or fallen trunks, those that do perch on tree branches usually sit lengthwise along them. In contrast, owlet-frogmouths are arboreal birds that characteristically sit crosswise on a branch in a fairly upright position, resembling small owls.1