From Academic Kids
Maniraptora is a group used in biological classification to cover the birds and the dinosaurs that were related to them. It is a sister group to Arctometatarsalia, and contains the subgroups Deinonychosauria, Oviraptorosauria, Therizinosauria, in addition to Aves (birds).
Maniraptors are characterized by elongated arms and hands, as well as a semi-lunate carpal in the wrist. Other basal maniraptor traits include the presence of a furcula, a distally shortened and stiffened tail, feathers, and an elongated, backwards-pointing pubis. The "killer claw" which characterizes dromaeosaurs may also be a basal trait.