A blue-gray gnatcatcher buzzes a very sleepy great horned owl in an attempt to drive the owl away. The gnatcatcher had a nest with nestlings nearby and in-between bouts of provisioning the chicks, the gnatcatcher would dive-bomb the owl. The owl had its own fledgling nearby and seemed exhausted from the previous night's activities. Unfortunately for the gnatcatcher, it was no more of a bother to the owl than a gnat...