Bats are fascinating visitors to our gardens, but identifying one can be surprisingly difficult. There are 18 bat species recorded in the UK, from tiny pipistrelles to much larger noctules. Most are active after dark, and many look remarkably similar as they fly past. This guide explains what to look for, how to narrow down the possibilities and where to find more information about individual UK bat species.
How to identify a bat in the UK
Have you ever been sitting in the garden on a summer evening when a small, dark shape suddenly darts past your head? One moment the sky is empty; the next, something is twisting and turning above the lawn, then vanishing into the dusk.
Chances are, you've just seen a bat.
The next question is usually a simple one: Which bat was it?
The answer isn't always straightforward. Bats are small, fast-moving and mostly active in low light. Many species look alike, and a brief glimpse rarely gives you enough information for a confident identification.
But you can start narrowing things down by paying attention to a few details: the size of the bat, its flight pattern, where it is hunting, when it appears and, if you have the right equipment, the sound of its echolocation calls.
You don't need to become a bat expert overnight. Start by noticing what the bat is doing, then use the guides below to explore the possibilities.
Which bats might I see in my garden?
The Common Pipistrelle and Soprano Pipistrelle are among the bats you're most likely to encounter around gardens, towns and villages. Both are tiny, agile hunters that feed on flying insects.
Other species you might see include the Noctule, which is larger and often flies high in open spaces, and the Brown Long-eared Bat, a more elusive species that often hunts close to vegetation.
The species you encounter will depend on where you live and the habitats nearby. Gardens beside water, woodland, mature trees and connected hedgerows may attract different bats from gardens surrounded by open farmland or dense urban development.
Seeing a bat doesn't necessarily mean it roosts in your house or garden. It could be passing through on its way to a feeding area, following a hedgerow or hunting insects above a nearby pond.
Five clues to help identify a bat
1. How big was it?
Size can help you narrow down the possibilities, although judging it accurately in flight is difficult.
Pipistrelles are particularly small, with bodies around 3.5–4.5 cm long. Noctules are noticeably larger, with a more robust appearance and broad wings.
Try to judge the bat against something familiar, such as the height of a hedge or the branches of a tree. Avoid relying on a single impression, though: distance, darkness and flight angle can make a small bat look much larger or a larger one seem surprisingly tiny.
2. How did it fly?
Flight behaviour can be one of the most useful clues.
- Fast, twisting and turning: a small bat weaving through the air may be a pipistrelle hunting insects.
- High and relatively direct: a larger bat flying rapidly above trees or open ground could be a Noctule or another open-air hunter.
- Close to water: a bat repeatedly skimming the surface of a pond or river could be a Daubenton's Bat, which often catches insects just above the water.
- Close to foliage: a bat manoeuvring around trees and hedges may be hunting among vegetation, where different species use different techniques to find prey.
These are clues rather than rules. Bats change their flight according to what they are hunting and the space available, so behaviour alone rarely proves an identification.
3. Where was it flying?
Look at the surroundings as well as the bat.
Was it crossing an open lawn, following a hedge, circling a streetlight or skimming a pond? Was it flying high above the treetops or close to the ground?
A bat's preferred hunting habitat can help distinguish between species that otherwise look similar. Water, woodland, mature trees, old buildings and connected hedgerows can all be important parts of a bat's local landscape.
4. What time did it appear?
Most UK bats are nocturnal, and many emerge around sunset or shortly afterwards.
A bat appearing early in the evening may be a species that commonly emerges soon after dusk, such as a Noctule or a pipistrelle. But emergence times vary with species, season, weather and location, so the clock is only one piece of the puzzle.
You may see bats more regularly from spring to early autumn, when flying insects are abundant. In winter, many bats spend long periods resting or hibernating, although some may become active during suitable conditions.
5. Could you hear its calls?
Bats use echolocation to navigate and locate prey. They emit high-frequency sounds and interpret the returning echoes, building up information about their surroundings as they fly.
Most of these calls are beyond our hearing range. A bat detector can make them audible or record them for analysis.
Different species often have characteristic calls, but identifying them by sound is not as simple as matching one species to one frequency. Calls can overlap, and the same bat may change its calls depending on its surroundings and behaviour. Some species are difficult to distinguish without experience and suitable recordings.
For a casual garden observer, a detector can add another fascinating layer to the experience. For a confident species identification, it may need to be combined with other evidence.
Can you identify a bat by sight alone?
Sometimes, but not always.
You may be able to recognise a distinctive species from its size, shape, flight or the habitat in which it is hunting. However, several UK bats are so similar that even a good photograph may not provide enough detail to tell them apart.
Pipistrelles are a good example. Common and Soprano Pipistrelles look very similar, and their echolocation calls are often the most useful way to separate them. Some species in the Myotis group, including Brandt's, Whiskered and other mouse-eared bats, can also be challenging to distinguish.
If you only saw a small bat flickering across the garden for a few seconds, it's perfectly reasonable to identify it as a likely pipistrelle rather than claim certainty about the exact species.
A useful wildlife record is one that reflects what you actually observed.
Explore our UK bat identification guides
Once you've narrowed down the possibilities, explore the individual species guides below. Each one looks more closely at identification, habitat, roosting behaviour, diet, flight and the likelihood of encountering that bat around gardens.
One of the UK's most familiar bats, often seen hunting small insects around gardens and buildings.
A close relative of the Common Pipistrelle, often associated with wetland and waterside habitats.
A woodland and garden visitor with exceptionally long ears, often difficult to spot because it can hunt quietly among foliage.
Often seen flying low over rivers and ponds, catching insects close to the water's surface.
Noctule
A larger bat that often hunts high in open air and may emerge while the sky is still light.
Serotine
A relatively large bat found mainly in southern parts of England and Wales, often hunting around pasture, gardens and buildings.
Natterer's Bat
A manoeuvrable hunter associated with woodland, parkland and other habitats where it can forage close to vegetation.
Whiskered Bat
A small, agile bat that can be difficult to separate from closely related species.
Brandt's Bat
Another small, woodland-associated bat that closely resembles the Whiskered Bat.
Barbastelle
A distinctive but elusive bat associated particularly with woodland, including areas with mature trees and suitable roosts.
Where do bats live?
Bats use a variety of places to rest, shelter and raise their young. These places are known as roosts.
Depending on the species and time of year, a roost might be a gap in a building, a roof space, a tree cavity, a crevice behind loose bark or a purpose-made bat box. Some species use different roosts throughout the year as their needs change.
A bat seen flying around your garden might be roosting nearby, but it could also be travelling from somewhere further away. The presence of bats in the area doesn't automatically mean they are living in your roof.
If you think bats are using your home, or you're planning building work that could affect a possible roost, see our guide to Bats in Your Garden & Home.
How can I see bats in my garden?
You don't need specialist equipment to begin watching bats. Choose a mild, reasonably calm evening and spend some time outside around sunset.
Look above hedges, tree lines, ponds and open areas. Give your eyes time to adjust, and watch for repeated movements rather than trying to follow every bat across the sky. If you see one following the same route several times, it may be hunting insects in a productive feeding area.
A bat detector can help you discover more about the bats visiting your garden, while a notebook can help you record the date, time, weather, location and flight behaviour. Over several evenings, you may begin to recognise familiar patterns.
Remember that a bat box is only one part of a wildlife-friendly garden. Bats also need insects to eat, connected routes through the landscape, suitable roosting places and dark areas where they can move and feed.
For practical advice on choosing and positioning a box, read our guide to Where to Put a Bat Box.
Are bats dangerous, and are they protected?
Bats are wild animals and should never be handled casually. They generally avoid people, but any bat that is caught or frightened may bite.
If you find a bat on the ground, injured or inside your home, seek advice from the Bat Conservation Trust or a local bat rescue contact rather than trying to manage the situation yourself. If you are bitten or scratched, wash the area thoroughly with soap and water and seek prompt medical advice.
All UK bat species receive legal protection. Their roosts are protected too, including places that may not contain bats at the moment you discover them. Never block a suspected access point, disturb a roost or carry out work that could affect bats without first getting appropriate advice.
For more information, visit the Bat Conservation Trust.
Frequently asked questions about UK bats
How many species of bat live in the UK?
There are 18 bat species recorded in the UK, with 17 known to breed here. Some are widespread, while others are scarce or restricted to particular areas and habitats.
What is the most common bat in UK gardens?
The Common Pipistrelle is one of the UK's most familiar and widespread bats. Soprano Pipistrelles are also frequently encountered, particularly around suitable wetland and waterside habitats.
What time of year can I see bats?
Bats are most often noticed from spring through early autumn, when flying insects are plentiful. Many emerge around sunset or shortly afterwards, although the timing varies with species, weather and season.
Can I tell which bat I saw from a photograph?
A photograph may help if it captures clear features, but many bats are difficult to distinguish by sight, particularly in flight. A photograph should never be taken in a way that disturbs a bat or its roost. For a difficult identification, seek help from a local bat group or the Bat Conservation Trust.
Why do bats fly around my garden?
Your garden may offer insects to hunt, a route between feeding and roosting areas, or access to water and vegetation. Bats can use a garden without roosting there, and you may not notice them every time they visit.
Do bats hibernate in winter?
Many UK bats spend periods of winter in hibernation or torpor when insects are scarce. Their behaviour varies by species, roost and weather, and some may become active during milder conditions.
A final thought
The next time you see a bat cross your garden, try not to worry too much about naming it straight away. Watch how it moves, notice where it flies and give yourself a moment to enjoy the sight.
A few seconds of observation can open up a whole new world of wildlife. And once you start recognising the different shapes and flight patterns, the darkness above your garden may never look quite the same again.
