Found 2 items, similar to Falco rusticolus.
English → English (WordNet) Definition: Falco rusticolus Falco rusticolus n : large and rare arctic falcon having white and dark color phases [syn: gyrfalcon, gerfalcon]
English → English (gcide) Definition: Falco rusticolus Gyrfalcon \Gyr"fal`con\ (j[~e]r"f[add]`k'n), n. [OE. gerfaucon, OF. gerfaucon, LL. gyrofalco, perh. fr. L. gyrus circle + falco falcon, and named from its circling flight; or cf. E. gier-eagle. See Gyre, n., Falcon.] (Zo["o]l.) One of several species and varieties of large Arctic falcons, esp. Falco rusticolus and the white species Falco Islandicus , both of which are circumpolar. The black and the gray are varieties of the former. See Illust. of Accipiter. [Written also gerfalcon, gierfalcon, and jerfalcon.] [1913 Webster]