Archaeopteryx had fully formed flying feathers (including asymmetric vanes and ventral, reinforcing furrows as in modern flying birds), the classical elliptical wings of modem woodland birds, and a large wishbone for attachment of muscles responsible for the downstroke of the wings<ref>A. Feduccia, "Evidence from Claw Geometry Indicating Arboreal Habits of Archaeopteryx," Science, 259(5096):790-793, February 5, 1993.</ref> | Archaeopteryx had fully formed flying feathers (including asymmetric vanes and ventral, reinforcing furrows as in modern flying birds), the classical elliptical wings of modem woodland birds, and a large wishbone for attachment of muscles responsible for the downstroke of the wings<ref>A. Feduccia, "Evidence from Claw Geometry Indicating Arboreal Habits of Archaeopteryx," Science, 259(5096):790-793, February 5, 1993.</ref> |