Here's a graph of bat echolocation calls throughout the night of 5/16. The yellow line shows the total number of chirps produced as the bats navigate and hunt over my backyard and around the bat house. Since each chirp is a whole set of clicks and very short tones, a single call can produce dozens of loggings. The bat detector converts each call into a series of pulses and each pulse gets counted by a microcontroller. That accounts for the high numbers originating from a maximum of about fifty individual bats who might be in range of the bat detector.
The light blue line is temperature, uncalibrated for now. It was probably in the mid 70's here last night.
The purple crosses are wind gusts, as counted by an anemometer located next to the detector. Maybe it is coincidence, but it does look as if bat activity picked up as the wind died down last night. Interesting.
The X axis is time, starting around 6:00 PM Saturday night, and ending around 8:00 AM this Sunday morning.
In future posts, I'll go explain the equipment that logs these data.
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