Why owl calls are worth learning

If you garden for wildlife, you already know the pleasure of a hedge alive with sparrows or a pond full of frogs. But the night shift is where things get truly wild. Owls sit at the top of the food chain in many British gardens, and their calls tell you whether your patch is part of a healthy, connected landscape. Learning to recognise a tawny owl’s hoot or a barn owl’s shriek is not just a party trick – it is a practical way to monitor the wildlife value of your native planting, your rough grass and your old trees. The good news is that you do not need expensive kit. A still night, a warm coat and a little patience will do.

The tawny owl: hoots, screeches and the famous 'twit twoo'

The tawny owl is our most common woodland owl, and the one you are most likely to hear from a suburban garden. Its classic call is often written as 'twit twoo', but that is actually a duet. The female gives a sharp, penetrating 'kewick' or 'twit', and the male answers with a soft, wavering 'hoo' or 'twoo'. Once you know the difference, you can tell which bird is which – and whether you have a pair.

• Male territorial hoot: a steady, rhythmic 'hoo-hoo-hooo', sometimes described as a shivering hoot. It carries a long way on a calm night and is repeated every few seconds.
• Female contact call: a sharp, slightly grating 'kewick' or 'twit', often given in reply to the male. This is the higher, more urgent half of the duet.
• Juvenile begging call: a harsh, persistent screech that sounds almost like a barn owl. Young tawnies use it from midsummer into autumn, and it can be surprisingly loud.
• Alarm call: a rapid 'witt witt witt' or a sharp 'kewick' repeated in agitation, often when a cat or fox is nearby.

Listen for tawnies at dusk and again just before dawn. Late autumn and winter are peak times for hooting, as pairs re-establish their bonds and defend territories before the breeding season.

The barn owl: eerie shrieks and hisses

Barn owls do not hoot. Instead, they produce a sound that has frightened many a night walker: a long, drawn-out shriek that descends in pitch and seems to hang in the air. It is not aggressive – it is a territorial and courtship call. If you hear it, you are probably near farmland, rough grassland or a grassy field margin, which is exactly where barn owls hunt for voles and shrews.

• Territorial shriek: a rasping, descending scream, often given in flight. It lasts about two seconds and can sound like a rusty gate or a distant fox.
• Hissing: a loud, snake-like hiss given at the nest site, especially by females. It is a warning, not a greeting.
• Snoring: young barn owls in the nest make a rhythmic snoring or purring sound. It is easy to miss, but once heard it is unmistakable.

To encourage barn owls, you need voles. That means leaving tussocky grass, native wildflower margins and rough corners undisturbed. Avoid rodenticides entirely – poisoned rodents are a major killer of barn owls. A traditional barn owl box can help, but it must be sited correctly, usually on a pole or building with a clear flight path over open ground.

Other night calls that can fool you

Not every night sound is an owl, and not every owl sounds like a tawny. Several species overlap in gardens and farmland, so it pays to know the alternatives.

• Little owl: a yelping, mewing 'kiew kiew' or a sharp 'wher-wher'. It sounds more like a small cat than a classic owl.
• Long-eared owl: a soft, low 'hoo' repeated every few seconds, often from a dense conifer or hedgerow. The begging call of young birds is a high, squeaky hiss.
• Short-eared owl: a barking 'chef chef' or a soft, rapid 'boo-boo-boo'. It is more often heard over open moorland and coastal rough grass than in gardens.
• Fox: a blood-curdling scream that is often mistaken for a barn owl. Fox screams are usually shorter, more staccato and end abruptly.

If you hear a repeated, soft hoot in woodland, check the rhythm. Tawnies hoot in a steady, wavering pattern. Long-eared owls hoot at longer intervals and sound flatter, almost like a dove with a cold.

How to tune your ears and your garden

You do not need a hide or a microphone. You need the right conditions and a garden that invites owls to stay. Start by choosing a still, dry night – wind and rain drown out calls. Listen from the edge of a hedgerow, a woodland ride or an open patch of rough grass. Avoid shining a white torch; if you must use light, fit a red filter.

• Best times: the hour after dusk and the hour before dawn. Tawnies call most in autumn and winter; barn owls shriek most in late winter and spring.
• Plant for prey: native trees such as oak, willow and field maple support insects and roosting spots. Shrubs like hawthorn, blackthorn and dog rose provide nest sites and cover for small mammals.
• Leave rough grass: a patch of tussocky native grasses – cocksfoot, Yorkshire fog, meadow foxtail – is a vole factory. Do not mow it all in one go; rotate cuts over two or three years.
• Add dead wood: log piles, brash heaps and old fence posts attract beetles and small mammals, which in turn feed owls.
• Nest boxes: tawny owls need a large, deep box with a 15–20 cm entrance, fixed high in a mature tree. Barn owl boxes are different – a long tunnel design, sited over open ground.

Keep cats indoors at night, and never use slug pellets or rodenticides. A garden that is good for owls is a garden that is good for everything else.

A year of owl listening

Owl calls change with the seasons, so you can build a whole calendar of listening. It is a lovely way to connect with your garden after dark.

• Autumn and winter: tawny owl duets. Listen for the female’s 'kewick' and the male’s answering hoot. This is the best time to map your local pairs.
• Late winter and spring: barn owl shrieks. Courtship flights and territorial calls peak as pairs prepare to nest.
• Summer: juvenile screeches. Young tawnies and barn owls beg loudly, often giving away hidden nests or roosts.

You do not need to identify every sound on your first night. Start with one call – the tawny’s hoot – and build from there. Each new recognition is a small window into the nocturnal life of your native plants, your hedges and your rough grass. And once you hear that first 'kewick' answered by a soft 'hoo', you will never mistake it for anything else.