The inside of the nest cavity is lined with fresh wood chips, and nest holes may be used repeatedly for several seasons. Nest cavities are drilled into large dead or living limbs in trees or snags, which may contain granaries. Courtship and pair-bonding displays are absent. Reproduction competition between males is displayed by attempts by a male to disrupt copulation between another pair. After females have established a normal laying sequence, egg destruction stops. There is often extreme reproductive competition between joint-nesting females, who regularly destroy eggs laid by their cobreeders. In groups that contain more than one female breeder, the female cobreeders lay their eggs in the same nest cavity. Generally, Acorn Woodpecker groups contain 1-7 male breeders that compete for matings with 1-3 egg-laying females. Mating systems of Acorn Woodpeckers range from monogamy in some populations to cooperative polygyny. Average basal metabolic rate 0.737 W AnAge.The wing span of the woodpecker ranges between 13-15 centimeters. In Colombian populations, the male has a solid red crown while the female has a black band separating the red crown from the white forehead. There is usually at least one red or yellow tipped feather on the throat. The Acorn Woodpecker is a medium-sized, black and white clown-faced bird with a red crown, glossy black and white head, white eyes, and white rump and wing patches. Urban parks and suburban areas that possess numerous oak trees are often also home to the species. They are also found in riparian corridors, and in Douglas firs, redwood and tropical hardwood forests as long as oaks are available nearby. The Acorn Woodpecker prefers pine-oak woodlands where oak trees are plentiful. The Acorn Woodpecker is found from northwestern Oregon, California, the American Southwest, and western Mexico through the Central American highlands and into the northern Andes of Colombia.
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