The single fossil is an incomplete semi-articulated skeleton the size of a sparrow. It includes both feet, the right leg, the sternum, part of the right arm, and fragmentary coracoids and pubes. Its accession number is IVPP11303. It is in the collection of the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing. It has advanced flight, perching, and respiratory adaptations like a long, deeply keeled sternum, a pair of anterolateral processes on the sternum near the articulations with the coracoids, fused, short, metatarsals, and highly curved pedal claws indicating good perching ability. Hou et al. (1996) described the metatarsals as fused only distally, but Zhou and Hou (2002) revised this analysis, finding that the metatarsus was fused distally and proximally, but not a