As the results of studies published by the Royal Society of London show, bats of the type of gray mumps use an unusually wide range of ultrasonic signals for navigating in the dark – from shrill cries to quiet whispers.
To learn more about the features of this biosonter, researchers installed infrared cameras and ultrasound microphones to record the voices of bats flying in the autumn over the coast of California.
Sound research continued for five nights. Approximately half of the 80 flights were shorter, faster and quieter than the voices of other species of bats. Usually, as the mice approach the object, the intensity of the signals increases, but here, literally halfway to the obstacle, the gray nightshocks did not make any sounds at all.
Such a hidden mode of flight explains a lot – in particular, quite a lot of collisions of mice with wind turbines. And the sounds are so quiet that they sharply reduce (about 3 times) the ability of bats to detect obstacles.
A legitimate question arises: Why do we need this “conspiracy”? Scientists suggest that by doing so, animals avoid unnecessary encounters with aggressive congeners during the mating season. In this case, the opportunity to hear the opponent is reduced from 92 to 12 meters. Apparently, this is a kind of tactic of behavior of male rivals.js.src = “&version=v2.8”; 'script', 'facebook-jssdk'));