Nightjar

Master of camouflage

The nightjar’s bark-patterned grey and brown plumage is among the most cryptic in the bird world. Roosting on the ground or lengthwise along a tree branch during the day, a nightjar is effectively invisible — the intricate pattern of streaks and barring perfectly imitates dead leaves, bark, and dappled shadow. Even experienced ornithologists nearly step on them. The only action that betrays a nightjar is movement.

The churring

The nightjar’s call is like no other bird sound in Europe — a mechanical, sustained churring that can continue for minutes without interruption. Produced by rapid vibrations of the throat muscles (not the syrinx, the normal bird vocal organ), it sounds like a distant engine or a loud grasshopper. The bird sings from a prominent perch — often a bracken frond or fence post — at dusk and dawn, and intermittently through the night. The pitch shifts slightly as the bird turns its head.

Goatsucker legend

The nightjar’s family name Caprimulgidae derives from Latin caprimulgus — goat-milker. The ancient legend (recorded by Aristotle) held that nightjars flew into goat herds at night and suckled from their teats, causing the goats to go blind. In reality, nightjars forage in twilight for moths and beetles flying above heathland, and any association with livestock was incidental. The legend persisted into the 18th century.

Heathland specialist

In Britain, the nightjar is strongly associated with heather and bracken heathland and young conifer plantations — open, low-vegetation habitats that provide the clear flight paths needed for hawking moths. As British heathland has declined and been fragmented, nightjar populations have become more dependent on managed lowland heath and early-stage forestry clear-fell.