Using specialized infrared cameras and ultrasonic microphones to record bats flying through river corridors in northern California, the researchers discovered that bats use short, extremely quiet “micro-calls.” At times, no echolocation calls at all were detected, even from bats flying within 10 feet of the highly sensitive audio recorders.
https://news.wfu.edu/2018/05/02/bats-go-uiet-during-fall-mating-season/
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