Definition: The Cinctiporidae, also known as the common cinctiperidids, are a group of mammals and birds that share a common ancestor with bats. This family includes various species from the order Pterodroma, which is divided into two main groups: the Pterodromida and the Pteroceratinae. The Cinctiporidae are characterized by their long, slender bodies, elongated wings, and large headparts that resemble those of bats.