Survey Results 2016-2018

Devon Bat Survey 3 year results 2016-2018

We’ve now put together the results from the first 3 years of the survey to produce the maps below. Nearly 1600 squares were surveyed in total (some of these are repeats). Of these, over 560 recorded greater horseshoes.

The map below uses tetrads to show the location of the survey areas. Although people selected a 1km grid square to deploy their detector, the map below shows a tetrad square (a 2km by 2km grid square used for biological recording) to make it easier to view.

Survey Areas 2016-2018

The second map shows ‘hotspots’ or the density of greater horseshoe bats, based on the sites surveyed. Just because an area of the map doesn’t show any greater horseshoes, it does not mean that they do not occur here. The strongest colours show where the most greater horseshoe passes were.

Greater Horseshoe Bat heat Map 2016-2018

A whopping 1,800,000 sound files have been recorded by the survey!

Whilst we have some great technological aids for helping us to work out which are bats, as well as birds, crickets and general noise, we still need to manually check lots of the files. As you can imagine, it takes a huge amount of time to process the survey results.

To take part in the next survey visit the Devon Bat Survey page.

Useful links;

To see the 2016 results click here

To see the 2017 results click here

To see the 2018 results click here

This survey was supported by Wildlife Acoustics.