Can bats hear human voice?

Yes, bats can hear human voices, though their hearing range is different from humans and adapted for echolocation. Most bats have excellent hearing and can hear frequencies from very low to very high, up to over 100 kilohertz, which is much higher than humans who hear up to about 20 kilohertz. Human voices typically range from about 85 hertz to 255 hertz for fundamental frequencies, with harmonics up to a few kilohertz, which is well within a bat's hearing range, so bats can hear humans speaking, shouting, and making other sounds. However, bats are more sensitive to high-frequency sounds used for echolocation, which are typically 20 to 200 kilohertz, and they may not pay much attention to low-frequency human speech unless it is loud or sudden. In roosts, loud human voices, shouting, and banging can disturb bats and cause them to wake, become agitated, and abandon roosts, which is why cave and attic roosts should not be disturbed. Some research suggests bats can learn to recognize individual human voices in captivity, distinguishing between familiar caretakers who feed them and unfamiliar people, showing less fear toward familiar voices. In the wild, bats around houses may hear humans talking and will generally avoid the area, as they associate loud human activity with danger. So while bats can hear human voices, they rely more on echolocation and high-frequency hearing for navigation and hunting, and human speech is not particularly meaningful to them except as a potential threat signal.