Sphyrapicus thyroideus
The Williamson's Sapsucker (Sphyrapicus thyroideus) is a strikingly dimorphic medium-sized woodpecker of western North America, renowned for its specialized sap-feeding habits. Males are predominantly glossy black with bold white wing patches, a bright yellow belly, a crimson chin patch, and a distinct white stripe behind the eye and another from the bill curving down the neck. Females, in stark contrast, feature a finely barred black and white back, a brown head, and a yellow wash on the bel...
Primarily inhabits mature coniferous and mixed coniferous-deciduous forests at high elevations, often favoring Ponderosa Pine, Douglas-fir, and aspen groves.
Primarily feeds on tree sap, obtained from meticulously drilled sap wells, and a variety of insects, especially ants caught in sap or gleaned from bark, as well as some berries and seeds.
Williamson's Sapsuckers are diurnal and spend much of their day drilling and maintaining sap wells, often in rows, on the trunks and branches of various trees. Their foraging strategy involves repeatedly drilling small, shallow holes into the phloem layer of trees, creating sap "wells" which they...
The Williamson's Sapsucker is a migratory species primarily found in western North America. Its breeding range extends from southern British Columbia and southwestern Alberta in Canada, south through the Cascade Mountains, Sierra Nevada, and Rocky Mountains in the western United States, reaching ...
Least Concern
- Williamson's Sapsucker exhibits one of the most extreme cases of sexual dimorphism among North American birds; males and females were once thought to be entirely different species. - Their diet heavily relies on tree sap, which they extract by drilling characteristic rectangular or round holes ...