The graphs below demonstrate how the numbers of bats counted emerging from each roost have varied between the more commonly recorded species at roosts this year, based on results received so far.
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Field Survey

The two images below illustrate:
LEFT : the peak numbers of bat passes at each site per species 
RIGHT : the peak numbers of spots or walks (out of 12) each species was recorded on at each site

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Waterway Survey

The graphic below illustrates:
TOP TWO GRAPHS: the peak numbers of Daubenton’s bat and “Daubenton’s bat unsure” passes per site
BOTTOM TWO GRAPHS: the peak numbers of spots (out of ten) where Daubenton’s bat and “Daubenton’s bat unsure” passes were recorded per site

Click on images to enlarge them.