Flammulated owls are small nocturnal owls. The researchers, students, and volunteers use mist nets to capture the owls. They attach geolocators and band the owls. Not an easy task at night in steep forests. The owls nest in tree cavities. The Flammulated owls are potentially a species of concern for the US Fish and Wildlife Service because of habitat destruction. Geolocators record light levels that correspond to sunrise and sunset times.