Bat Echolocation: How We Identify Bat Species
Bats navigate the world in a remarkable way. Instead of relying on sight, they use sound to build a detailed picture of their surroundings. This ability is called echolocation. By listening to the returning echoes of their own calls, bats can locate insects, avoid obstacles, and find safe routes through the landscape.
Echolocation also allows ecologists to identify different bat species in Scotland. Each species produces calls with patterns that are characteristic and recognisable. This blog explains how echolocation works and why it is such an important tool for understanding bats.
How echolocation works
Bats produce very high-frequency sounds. These calls bounce off nearby objects and return as echoes. By interpreting these echoes, bats can judge distance, movement, and size with impressive accuracy. Echolocation is so refined that bats can track tiny insects in complete darkness.
People cannot hear most bat calls, but acoustic detectors allow specialists to record and study them.
Each species has its own call pattern
Different bat species produce calls at different frequencies, shapes, and speeds. These patterns are consistent enough that trained ecologists can recognise species from recordings.
For example:
Common pipistrelles typically echolocate around 45 kHz.
Soprano pipistrelles use higher frequencies, usually around 55 kHz.
Nathusius’ pipistrelles tend to call around 39 kHz.
These frequency ranges help separate species that look very similar and often share the same habitats.
How ecologists record bat calls
During bat activity surveys, ecologists use handheld or static detectors to record echolocation calls at dusk and dawn. Static detectors can also be left out for several nights to gather a more complete picture of bat activity across a site.
Specialist software then displays the call shapes visually. These shapes, called sonograms, help identify species and show how bats are using a landscape. For example, a fast, shallow call pattern might indicate feeding, while a more direct sequence might show commuting behaviour.
Why echolocation is so important in surveys
Echolocation recordings provide precise information that can be difficult to gather in any other way. They help ecologists understand:
which species are present
how many bats are active
where bats are feeding
how bats move through a site
This information supports responsible development and helps protect roosts and important habitats.
What echolocation tells us about Scotland’s bats
Echolocation patterns reveal how bats respond to weather, artificial lighting, and changes in habitat. Increasing use of acoustic detectors across Scotland has also improved understanding of species such as Nathusius’ pipistrelle, which has been recorded more frequently in recent years around large waterbodies.
These insights contribute to wider conservation efforts and help communities appreciate the range of bat species living nearby.
How the public can get involved
People who enjoy wildlife recording can borrow or use bat detectors through community groups and local projects. Learning to recognise call patterns is a great way to understand Scotland’s bat species and support monitoring schemes. All records contribute to national datasets and strengthen conservation work.
Echolocation is an extraordinary adaptation and a powerful tool for understanding these fascinating animals. By listening to the sounds bats make, ecologists can monitor their wellbeing and help ensure that Scotland’s landscapes remain rich in wildlife.
References
Bat Conservation Trust 2023. British Bat Calls: A Guide to Species Identification. Bat Conservation Trust, London.
NatureScot 2020. Bats: Licensing and Guidance. NatureScot, Inverness.
Russ, J. 2012. British Bat Calls: A Guide to Species Identification. Pelagic Publishing, Exeter.