KyLessian fruit bats were carnivorous, feathered bats native to KyLessia that swarmed their prey. Their name referred to their living in wulfruit trees; they did not eat fruit. The small black creatures had webbed wings, and their skin grew feather-like scales. Tooth enamel was dark gray, almost black, for invisibility at night. It was originally thought that KyLessian colonists' livestock losses were due to larger predators; but infrared observations proved that the fruit bats hunted on cloudy nights, when there was no starlight nor any light from KyLessia's three moons. KyLessian fruit bats communicated with each other by using ultrasonic calls above the range of normal human hearing.