Nests are also sometimes placed in proximity to stands of willow. It is this activity that has given the birds their name. Willows are generally found in low lying areas where the water table is high. However, birds may fly quite a distance from their nests to reach these willows. Sapsucker nest holes are about 4 cm in diameter and circular.
Fresh holes are perfectly circular with a smooth outline.
With time and usage the edge of the hole becomes progressively rougher. By contrast, holes of previous years become progressively smaller, narrowed by the tree's subsequent growth. This dark area results from the constant rubbing of the tail feathers against the tree during nest excavation. Incubation of the eggs by both sexes of sapsuckers lasts about 12 to 13 days. Hatching takes place about mid to late June.