The country's first bat survey has identified 12 different species in Norfolk alone.
So far this year, monitoring stations have recorded a quarter of a million bat calls in the hope of finding out more about their habitat and lifestyle.
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It will be sunny and hot in places on Saturday. Sunday will be cooler with showers later.
For some parts of the region, there's a risk of thunderstorms tonight before a mainly fine weekend.
Suffolk fire crews and care home managers have been practicing a major fire at a nursing home near Bury St Edmunds.