Nightjar Guide: Identification, Habitat, Behaviour and Facts

Nightjar Guide: Identification, Habitat, Behaviour and Facts

The nightjar is one of the UK’s most mysterious and fascinating birds.

Rarely seen but often heard, this nocturnal species is famous for its haunting call, incredible camouflage, and unique behaviour.

In this complete guide, you’ll learn how to identify nightjars, where to find them in Britain, and why they are so important to UK wildlife.

What Is a Nightjar?

Genus: Caprimulgus

Species: europaeus

The European nightjar is a medium-sized nocturnal bird found across parts of Europe, including the UK.

Unlike most birds, nightjars are active at dusk and night, feeding on flying insects in open landscapes.

They are often mistaken for small owls, but they are actually part of a different bird family known for their wide mouths and silent flight.

Nightjar Identification

Identifying a nightjar can be tricky due to its excellent camouflage, but here are the key features:

Size: Similar to a blackbird

Plumage: Mottled grey, brown, and black (perfect for blending into tree bark and ground)

Wings: Long and pointed

Eyes: Large and adapted for low-light vision

Distinctive feature: Males have white patches on wings and tail

Tip:

You’re far more likely to hear a nightjar before seeing one.

What Does a Nightjar Sound Like?

The nightjar is best known for its distinctive “churring” call—a continuous, mechanical sound that can last for several minutes.

• Often heard at dusk and dawn

• Sounds like a soft engine or spinning reel

• Males may also clap their wings during display flights

This makes them one of the easiest nocturnal birds to identify by sound alone.

Where Do Nightjars Live in the UK?

Nightjars prefer open, dry habitats with plenty of insects. You’re most likely to find them in:

• Heathlands

• Open woodlands

• Forestry plantations

• Moorland edges

Best UK Locations

• Southern England (Dorset, Hampshire, Surrey)

• East Anglia

• Parts of Wales and Scotland

They are summer visitors, arriving in the UK around May and leaving by September to migrate to Africa.

Nightjar Behaviour

Nightjars have several unusual behaviours that make them stand out:

1. Nocturnal Hunting

They feed on moths and other flying insects, catching them mid-air using their wide, bristle-lined mouths.

2. Ground Nesting

Unlike most birds, nightjars don’t build nests. Instead, they lay eggs directly on the ground, relying on camouflage for protection.

3. Camouflage Experts

During the day, they rest motionless on the ground or along branches, making them nearly impossible to spot.

Nightjar Diet

Nightjars are insectivores and mainly feed on:

• Moths

• Beetles

• Flies

Their feeding habits make them an important part of the ecosystem, helping to control insect populations.

Are Nightjars Rare in the UK?

Nightjars are considered a species of conservation concern in the UK, although their numbers have improved slightly in recent decades due to habitat management.

Population Trend

Status: Recovering but still vulnerable

Main threats:

• Habitat loss (especially heathland)

• Disturbance from human activity

• Decline in insect populations

Conservation efforts, including habitat restoration and protection, have helped stabilise some populations.

The UK population is typically estimated at around 4,500–5,000 breeding males (often used as a proxy for breeding pairs)

This equates to roughly 9,000–10,000 adult birds during the breeding season

How to See a Nightjar in the UK

Spotting a nightjar requires patience and the right conditions:

• Visit suitable habitats at dusk (May–August)

• Listen for the churring call

• Look for low, silent flight over open ground

• Stay on paths to avoid disturbing nesting birds

Pro Tip

Bring binoculars and focus on sound first, sight second.

Interesting Nightjar Facts

Nightjars were once called “goatsuckers” due to a myth that they drank milk from goats

They can remain completely still for hours to avoid detection

Their flight is silent and bat-like, often confusing observers

They migrate thousands of miles between the UK and Africa each year

Interesting Nightjar fact

The “goatsucker” myth is one of the strangest and oldest stories associated with the European nightjar.

The scientific genus name Caprimulgus literally means:

“capra” = goat

“mulgere” = to milk

So it translates to “goat milker” or “goatsucker.”

This idea dates back to ancient times, especially to the Roman writer Pliny the Elder, who claimed that nightjars:

• Flew into goat pens at night

• Drank milk directly from goats

• Caused goats to go blind or ill

This myth likely came from a combination of real observations:

1. Night activity around livestock

Nightjars are active at dusk and night and were often seen flying around:

• Goats

• Sheep

• Cattle

2. Insects attracted to animals

Livestock attract lots of insects, especially moths and flies — the nightjar’s main food.

So the birds were actually feeding on insects, not milk.

3. Unusual appearance

Large mouth

Bristle-like feathers around the beak

Silent, ghostly flight

To early observers, this may have looked eerie and unnatural, reinforcing superstition.

The reality:

Nightjars do not drink milk.

They cannot suck or consume liquid like that. They are strictly insect-eaters, catching prey in flight

The myth stuck for centuries. Even today, the name “goatsucker” is still sometimes used, despite it being completely inaccurate.

Why Nightjars Matter

Nightjars are an important indicator of healthy heathland ecosystems. Their presence suggests:

• Abundant insect life

• Well-managed open habitats

• Low levels of disturbance

Protecting nightjars helps conserve a wide range of other species that depend on similar environments.

Conclusion

The nightjar is one of the UK’s most unique and elusive birds. With its haunting call, remarkable camouflage, and nocturnal lifestyle, it offers a glimpse into the hidden world of Britain’s night wildlife.

Whether you’re a casual nature lover or a dedicated birdwatcher, hearing a nightjar’s churring call on a summer evening is an unforgettable experience.

FAQs About Nightjars

What time of day are nightjars active?

Nightjars are most active at dusk and dawn, though they may remain active throughout the night.

Do nightjars live in gardens?

They rarely visit gardens, preferring heathlands and open countryside.

Are nightjars endangered in the UK?

They are not endangered but are considered vulnerable, with conservation efforts helping stabilise their population.

What do nightjars eat?

They primarily eat moths and other flying insects, catching them in flight.

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