Neonatal Vocalizations of Ten Species of Malaysian Bats (Megachiroptera and Microchiroptera)

As infants, bats emit non-sonar calls that are species typical. Five different species of Hipposideros have contrasting neonatal calls. The calling rates increase and then wane with age in the same general pattern as seen in rodents. Infant bat calls show greater frequency sweep and higher repetition rates than those of rodents. In contrast to microchiropterans, infants of a megachiropteran, Eonycteris , emit calls with a lower repetition rate; the calls show no increase in frequency with age.