Daniel Ashworth
Why a Village Pond Makes the Perfect Bat Theatre
There is a particular moment, half an hour after sunset on a mild June evening, when a village pond stops being a pond and becomes a hunting ground. Insects rise off the water, the light turns the colour of weak tea, and a small dark shape flickers past your shoulder, so fast you half-wonder if you imagined it.
Ponds are brilliant for bats because they are brilliant for insects: sheltered water, emerging midges and caddisflies, and a warm surface that holds the day's heat longer than the surrounding fields. Add trees for shelter and a hedge to commute along, and you have everything a bat needs within a short flight of its roost.
You need almost nothing to enjoy it. Patience, a still evening, and a torch dimmed with red. That is the whole kit.
Pick a Still, Mild Evening
Bats are weather-dependent, and a poor night will teach you nothing. Choose carefully.
- Warmth. A day that reached 15°C or more, with a mild evening to follow, brings out insects and bats together. Below about 10°C, activity falls away.
- Low wind. A gentle breeze is tolerable; a stiff one sends small bats home. Sheltered ponds fish better than exposed ones.
- No heavy rain. Light drizzle is fine; proper rain is not.
- A little cloud helps. Clear, frosty nights are beautiful and usually bat-free.
High summer is peak season, but you can watch from April, when the first pipistrelles wake, right through to October, when they fatten before winter.
Settle In Before the Light Goes
Arrive 30 to 40 minutes before sunset and find a spot with a clear view across the water and something solid at your back. Sit down, then sit still.
This is the part most people rush. Bats are wary of movement and noise, and someone arriving at the last minute sees very little. Give yourself ten minutes of doing nothing at all. Listen to the ducks. Watch the light leave the water. Common pipistrelles often appear while you are still settling in, so keep your eyes on the open water and the gaps between the trees. A notebook is useful too — times, weather and species start to form patterns after a few evenings.
Use a Red-Filtered Torch — Gently
A torch helps, but a white beam is unkind. Bats see well, and a bright light can dazzle them and send them away. Red light disturbs them far less, which is why bat workers use it.
- Fit a red filter over the lens, or choose a torch with a red setting.
- Keep it dim. You want a soft glow, not a searchlight.
- Use brief sweeps. A second or two is plenty. Follow a bat for a moment, then switch off.
- Shine low and wide, across the water rather than up into the sky, and away from other people's eyes.
If you have a bat detector, so much the better. A heterodyne detector around 25 kHz picks up the dry clicking chatter of a common pipistrelle, 35 kHz catches soprano pipistrelles, and 45 to 50 kHz brings in the slower, wetter slaps of a Daubenton's bat. Even without one, the torch will do.
Reading the Flight
Half the pleasure is working out who is who. Watch the way each bat moves.
- Common pipistrelle. Tiny, fast and jerky, hunting a few metres above the water. A moth with attitude.
- Soprano pipistrelle. Virtually identical, but tends to work closer to trees and hedges.
- Daubenton's bat. The star of the pond. Low, straight and purposeful, skimming the surface in long runs, sometimes taking insects off the water itself. Pale belly, dark back.
- Noctule. Big, high and early, often over the treetops, with a flickering, bird-like flight.
- Brown long-eared bat. Slow, fluttering and floppy, close to vegetation, with a very quiet call.
Daubenton's are the ones to watch for. Find open water with no overhanging branches and wait for that low, unhurried glide — a bat that never quite seems to touch the surface.
Keep the Bats Safe and the Pond Welcome
All British bats and their roosts are protected by law. Watching is fine; touching, catching or disturbing is not, and handling one requires a licence. Keep your distance, keep your torch low, and never shine a light into a roost or a hole where bats might be emerging.
Leave the pond as you found it: no trampled reeds, no litter, no nets. Keep dogs on leads near the water at dusk, close gates behind you, and give livestock a wide berth. If you find a grounded bat or suspect a roost, contact your county bat group rather than intervening yourself.
And do go back. The same pond in May and in September is two different places, and the more evenings you spend there, the more you will notice — the shift in species as the season turns, the emergence time creeping earlier, the night a Daubenton's finally skims within a few feet of your boots.
