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How long does incubation last for nightjar eggs?
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Caprimulgiform
Male common nightjar (Caprimulgus europaeus) landing
The incubation period for nightjar eggs is approximately 19 days.12
During this time, the eggs may be incubated by both adults or by only the female, as this behavior can vary even within the same species. Unlike many other birds, nightjars do not construct traditional nests; instead, they deposit their eggs directly onto the ground, on leaf-covered woodland floors, or occasionally on flat, gravel-covered rooftops.21