The genus Sphyrapicus comprises 4 species, commonly named the sapsuckers. They are: Williamson's Sapsucker Sphyrapicus thyroideus, Yellow-bellied Sapsucker Sphyrapicus varius, Red-naped Sapsucker Sphyrapicus nuchalis, Red-breasted Sapsucker Sphyrapicus ruber. As the name suggests, sapsuckers feed primarily on tree-sap. All species breed in North American and are (to varying degrees) migratory, some moving southwards as far as Central American in winter. Photo: Male Yellow-bellied Sapsucker, Central Park, NYC, USA, Bill Benish.