The yellow-bellied sapsucker (Sphyrapicus varius) is a medium-sized woodpecker that breeds in Canada and the northeastern United States.
Taxonomy
The yellow-bellied sapsucker was described and illustrated using a hand-coloured plate by the English naturalist Mark Catesby in his The Natural History of Carolina, Florida and the Bahama Islands which was published between 1729 and 1732. When in 1766 the Swedish naturalist Carl Linnaeus updated his Systema Naturae for the twelfth edition, he included the yellow-bellied sapsucker, coined the binomial name Picus varius and cited Catesby's book. The specific epithet varius is the Latin word meaning "various", "diverse" or "variegated". Linnaeus specified the type locality as America septentrionali (North America) but the locality is now restricted to South Carolina. The yellow-bellied sapsucker is now placed in the genus Sphyrapicus that was erected in 1858 by the American naturalist Spencer Baird with the yellow-bellied sapsucker as the type species. Within the genus Sphyrapicus, the yellow-bellied sapsucker is sister to a clade containing the red-breasted sapsucker (Sphyrapicus ruber ) and the red-naped sapsucker (Sphyrapicus nuchalis). The species is monotypic: no subspecies are recognised.
Description
The yellow-bellied sapsucker has a length of around , and an average weight of , although this can range anywhere from . The yellow-bellied sapsucker has a wingspan that ranges from . The forehead is coloured bright red in the male (and very occasionally yellow), and a lighter shade of red in the female. Sometimes, this is the only place on the head a female will have red colouration, if it has any at all, as the female rarely has a black head with a few buff spots. The crown is bordered black, and is usually red, and is sometimes mixed with black in the female. There is a white stripe, starting above the eye, that extends and widens to the nape, being broken up by a thin black line on the hindneck. There is a broad black stripe going through the ear-coverts and down to the side of the neck. Below this black stripe is a white stripe that goes from the nasal tufts to the side of the breast. The throat and chin can be used to differentiated between the sexes, as they are white in the female, and red in the male.
The mantle of this sapsucker is white, and there are irregular black bars that extend from it to the rump. The lower rump is white, and the uppertail-coverts are white with some black webbing. The wing coverts are black, and there is a white panel on the medians and central greater-wing coverts. The flight feathers are black with white tips. The innermost tertials are white and black. The underwing is barred greyish and white. The uppertail is black, with some white webbing and white tips sometimes being present on the outer feathers. The underparts, excluding the pale breast and above, are tinged yellow, transitioning to a whiter colour in the lower region of them. The side of the breast down to the undertail coverts have black arrowhead-shaped markings.
The chisel-tipped bill is relatively short and straight, with a slate to blackish colour. The legs are blue-grey to green-grey in colour, and the irides are a deep brown. The juvenile is a dark olive-brown colour overall, with a buff-striped head and a streaked crown. The throat is usually white, although in the male, there may be some red. The upperparts are generally a mottled pale and blackish colour. The breast is scaly, and the central part of the belly is a very pale yellow colour. The tail is barred more than in the adult.
Vocalizations and communication
The yellow-bellied sapsucker, usually the male, utilizes a long distance nasal "neaaah", "owee-owee", "wee-wee-wee-wee", or "kwee-urk" at the start of breeding to attract its mate to various places within its territory. When birds of a family group meet, they exchange low "week week", "wurp wurp", or similar low calls. A scratchy "quirk quirk" is given when pairs meet at the breeding territory. When it is alarmed, this bird will utter a soft mew call, getting louder and hoarser as the threat increases. During a conflict, it produces a shrill "quarr".
This sapsucker drums on materials that reverberate loudly, with drums starting as rapid bursts but becoming more drawn out as time goes on. The bursts usually last between one and a half and five seconds. These drums were previously thought to be used to indicate quality of a nesting or feeding site, but it is likely that they are used as a form of long-distance communication. Trees chosen to drum on are dead, and thus are not those used for feeding or nesting.