The Williamson's Sapsuckers (Sphyrapicus thyroideusis) are endemic to the western part of North America, from British Columbia to northern Mexico, where they are found in open forested areas, including conifers.
They are permanent residents in some parts of their range. Others form small flocks and migrate as far south as central Mexico.
Indications are that their numbers are declining in some parts of their range due to habitat loss.
Adult males are irridescent blank on their head, back, sides and tail. There is a white stripe behind the eye and a lower white stripe across each side of the head, a red chin and a bright yellow belly. They have black wings with large white patches.
The female is mainly black with a pale yellow breast, a brownish head with black streaking and fine barring on the back, breast and sides.
Distribution / Habitat:
They excavate a new nesting cavity each year, sometimes on the tree used in prior years. They drum to establish territories.
Insects are their man food source, particularly in the breeding season, when they have a higher need for protein. They also feed on sap, mainly from conifers, as well as berries.
Species Research by Sibylle Johnson
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