Specimens of Archaeopteryx length. These hindlimb proportions agree roughly with those of the London specimen. The claw arc of the central pedal digit is about 120 degrees, which is close to the average for all "Archaeopteryx" specimens. This arc is also close to the average for that in perching birds and is well above the mean for ground-dwelling birds, despite conclusions against perching habits based on the short hallux and weak flexor tubercles. The remarkably preserved plumage is one of many features that sets the Berlin specimen head-and-coracoids above all other "Archaeopteryx" fossils to date. Clear feather impressions are visible on both wings,
Specimens of Archaeopteryx that "Archaeopteryx" could have raised its short second toe in a similar manner to its dromaeosaur cousin "Deinonychus", whose second toe bore an enlarged "sickle claw" for probable use in predation. It remains unclear whether "Archaeopteryx" also used its hyperextended toe-claw in a similar fashion or for some other purpose. Taken together, many of the unique features of the skull, feet and coracoid strengthen a close relationship of archaeopterygids to deinonychosaurian theropods. Well-preserved imprints of wing and tail plumage show details of the barbs, but not barbules, and the shafts of 11 primaries can be counted on the right wing.