ORDER II. The PICÆ, have a convex, compressed bill, resembling a knife.—This order contains 23 genera, viz. Trochilus, Certhia, Upupa, Glaucopis, Buphaga, Sitta, Oriolus, Coracias, Gracula, Corvus, Paradisea, Ramphastos, Trogon, Pittacus, Crotophaga, Picus, Yux, Cuculus, Bucco, Boceros, Alcedo, Merops, Todus.