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Woodpeckers tend to be sexually dimorphic, but differences between the sexes are generally small; exceptions to this are Williamson's sapsucker and the orange-backed woodpecker, which differ markedly. The plumage is moulted fully once a year apart from the wrynecks, which have an additional partial moult before breeding. [8]
A sapsucker's tongue is adapted with stiff hairs for collecting sap. Red-breasted sapsuckers visit the same tree multiple times, drilling holes in neat horizontal rows. A bird will leave and come back later, when the sap has started flowing from the holes. Repeated visits over an extended period of time can actually kill the tree. [9]
They have black wings with large white patches. The female is completely different in appearance: mainly black, with a pale yellow breast, a brownish head with black streaking and fine barring on the back, breast and sides. Originally, the female was considered to be a different species and named the black-breasted woodpecker by Cassin ...
Holes left by a sapsucker. As their name implies, sapsuckers feed primarily on the sap of trees, moving among different tree and shrub species on a seasonal basis. Insects, especially those attracted to the sweet sap exuding from sap holes, are often captured and fed to the young during the breeding season.
The red-naped sapsucker is a medium-sized woodpecker, [11] measuring 19–21 cm (7.5–8.3 in) long and weighing 32–66 g (1.1–2.3 oz). [12] Adults have a black head with a red forehead, white stripes, and a red spot on the nape; they have a white lower belly and rump.
The yellow-bellied sapsucker has a length of around 19 to 21 centimetres (7 + 1 ⁄ 2 to 8 + 1 ⁄ 4 in), and an average weight of 50.3 grams (1.77 oz), although this can range anywhere from 35 to 62 grams (1.2 to 2.2 oz). The yellow-bellied sapsucker has a wingspan that ranges from 34 to 40 centimetres (13 + 1 ⁄ 2 to 15 + 3 ⁄ 4 in). [10]
The red-bellied woodpeckers use vocal signals to attract and communicate with potential mates. [13] A low "grr, grr" sound is observed in a pair of woodpeckers from the start of courtship until the end of the breeding season. [13] In an intraspecific conflict, red-bellied woodpeckers usually make a loud "chee-wuck, chee-wuck, chee-wuck" sound ...
Lewis's woodpecker nests in a cavity excavated from a dead tree branch. The Lewis's woodpecker, however, will not excavate its own cavity, but instead nest in a pre-existing cavity in a tree. The nest are usually made around 1 to 52 meters high from the ground. [15] The female will lay between 5 and 9 eggs, which are plain white in coloration.