A Sound That Arrives With the Warmth

Nightjars are among the last of our summer migrants to arrive. Swallows and willow warblers are already back and busy by the middle of April, but the nightjar waits. It is timed to the point where dusk insects are flying in numbers and the nights are no longer cold enough to silence a singing bird. On southern heaths the first males usually appear in the second week of May, and by the final week of the month the full chorus is in place.

That narrow window explains most disappointments. People go too early in the season, or too late in the evening, and then stand in a beautiful, apparently empty place wondering what they did wrong. Nothing, usually. It is simply a bird that rewards patience and a little local knowledge more than any amount of enthusiasm.

What the Churring Actually Sounds Like

The song is a sustained, mechanical reel — a purring rattle that carries a surprising distance and seems to come from everywhere and nowhere at once. Imagine a small engine idling badly behind a hedge, or a fishing reel spinning against a slipping clutch. It runs for minutes at a time, rising and falling slightly in pitch, then stops abruptly.

That silence is the useful part. Males typically churr from a favoured perch — a dead birch stub, a low pine branch, sometimes flat on the ground — and when one stops, it often shifts position before starting again. Listen for the second burst from a different angle. Between songs you may hear a soft, far-carrying cu-ick, the flight call, and in display flight a sharp, whip-like clap of the wings above the treeline. Many people mistake the churr for a distant two-stroke engine or a frog chorus. Neither will be sitting in the dark on a gorse bank in June.

Reading the Heath at Dusk

Nightjars need bare ground for nesting, low vegetation for shelter and taller perches nearby for singing. That combination is what you are looking for: open heather and sandy tracks, patches of bracken, scattered birch and gorse, and a young or broken woodland edge close by.

In practice this means lowland heathland, cleared conifer plantations and their regrowing fringes, forestry tracks cutting through heath, and the scrubby edges where a ride meets older trees. The New Forest, the Dorset heaths, the Surrey and Hampshire greensand heaths, the Breckland pine lines and parts of the Suffolk coast all hold birds, as do scattered sites in Yorkshire and eastern Scotland. Dense mature woodland, wet bog interiors and heavily grazed short turf rarely deliver. Walk the seam between open ground and tall vegetation, and walk it slowly.

Timing Your Visit

The season runs from mid-May to late July, with June the strongest month. Within any evening, aim to be in position well before you expect anything to happen. Woodcock often start roding as a useful cue, and churring usually begins roughly twenty to forty minutes after sunset — around 21:15 to 21:45 in mid-June in the south, later further north.

Conditions matter as much as dates. Choose a warm, still evening with light cloud; wind shuts birds down quickly. A full or nearly full moon can keep them singing for hours, and a brief shower rarely stops them. Cold, clear and breezy is the combination to avoid.

Fieldcraft That Keeps Them Singing

Nightjars are protected and ground-nesting, and a singing male is a bird on territory. Enjoy it from a distance and leave it alone.

• Never use playback. It draws birds off territory and into needless conflict, and on popular heaths it happens far too often already.
• Stay on tracks and paths. Nests, eggs and chicks are laid directly on the ground and are near-impossible to see in fading light.
• Use a red-filtered torch if you must use one at all. White light kills the moment, and eyeshine from a nightjar is a red-orange glint you should resist following.
• Close your eyes and turn slowly to fix direction. Churring is ventriloquial and judging distance by ear alone is genuinely difficult.
• Keep dogs on a short lead after sunset. Adders are out on the same warm paths, and so are roosting birds.

Kit for a Long, Cool Sit

This is a sit-and-wait activity, not a walk, and heathland evenings turn chilly fast once the sun drops. Take a folding stool or a sit mat, a flask, a midge head net, long sleeves and trousers tucked into socks, and a tick tool in the pack. A light waterproof is worth carrying even on a settled forecast. A red torch, an OS map and a compass — or a charged phone with a map saved offline — will get you back along unlit tracks without stumbling into a bog.

Stay put for the full hour after the first burst of churring. Birds often go quiet around dusk and then start again properly in deep twilight, and the best of the evening — the wing claps, the flight calls, the second and third birds answering from neighbouring clearings — usually happens after most people have given up and gone home.