Williamson's Sapsucker (Sphyrapicus thyroideus)
- Facts about the physical appearance, range, ecology, and conservation status of this species. Includes a photo.
- http://imnh.isu.edu/digitalatlas/bio/birds/wdpkrs/wisa/wisa_mai.htm

Yellow-bellied Sapsucker (Sphyrapicus varius)
- Read about the diet, breeding habitat, and winter habitat of this species. Includes an image and range map.
- http://www.nenature.com/YellowBelliedSapsucker.htm

Red-naped Sapsucker (Sphyrapicus nuchalis)
- Outlines the physical characteristics and life history of this bird. Includes a photo.
- http://www.mbr-pwrc.usgs.gov/id/framlst/i4021id.html

Red-breasted Sapsucker (Sphyrapicus ruber)
- Photos of the adult of this species.
- http://www.birdphotography.com/species/rbsa.html

Sphyrapicus nuchalis (Red-naped Sapsucker)
- Physical description, song, distribution, and habitat of this species.
- http://imnh.isu.edu/digitalatlas/bio/birds/wdpkrs/rnsa/rnsa_mai.htm

Appalachian Yellow-bellied Sapsucker
- Research on the status and conservation of a subspecies of Sphyrapicus varius endemic to southern Appalachian Mountains.
- http://biology.mhc.edu/ybsa/