Yellow-bellied Sapsucker (Sphyrapicus varius) Science Article 2
abstract
The subspecies of the Yellow-bellied Sapsucker (Sphyrapicus varius) are strongly characterized not only in morphology but in migratory habits as well. General outlines of the breeding ranges and winter ranges of the four subspeciesa re given in figures 1 and 2.These illustrate the well-known facts that S. v. varius is the most highly migratory of North American woodpeckers, S. v. nuchalis is moderately migratory, S. v. daggetti s still less so, and S. v. ruber is almost sedentary.
THOMAS R. HOWELL, the AUK(70), 1953