Bat out and about

Yesterday afternoon in bright sunshine a bat was hawking up and down the tree line on our West Field. It is so unusual to see bats flying in full daylight that I wondered why it was out. The only thing I can think of is that it had just come out of hibernation and was very hungry. It seemed to be catching insects so hopefully it will be OK. I got out my crude bat detector which simple measures the frequency of the echolocation and it was strongest at 50kHz which is not a great deal of help in identifying to species level. The way it was hawking and its fast flight mean it wasn't a pipistrelle. Its small size doesn't narrow it down much either. I need to get a more helpful bat detector!