Melanerpes formicivorus, Acorn woodpecker, has seven subspecies.
Oak woodpeckers are very unusual woodpeckers that live in large groups and cooperate to hoard acorns. Each team member collected hundreds of acorns and wedged them into small holes cut in tree trunks or telephone poles. They also spend a considerable amount of time catching insects.
Oak woodpeckers are an industrious and united group of birds that usually live in family groups. Each family has several "helper" woodpeckers, who have not yet produced their own offspring, but who spend their days collecting acorns and other food for their chicks. Thousands of acorns are stored each year, and each team member is always vigilant in protecting the hoarded food and preventing small thieves from stealing it.
In the spring after the oak harvest, the average number of new generation birds in the household increased, with each helper woodpecker responsible for an average of about 0.7 more chicks. But during poor harvests, helper birds slightly reduced overall reproductive success.
Oak woodpeckers specifically choose dead trees to store their acorns, and sometimes telephone poles and wooden houses, after which there is basically no complete place. They have a stiff, wedged beak, and spend their days searching, hammering, and burrowing in the woods, hiding acorns in the little holes they pick.
The breeding season for oak woodpeckers is from April to June. Nest in a hole in a tree. The interior is lined with wood chips and dead grass. Each clutch lays 4-6 eggs, and the male and female incubate the eggs in turn. Young birds are late sex.
In a study conducted in California's Santa Clara Valley, oak woodpeckers were sensitive to urbanization due to a lack of mature trees containing borers, and European starlings competed with acorn woodpeckers for tree holes. Oak woodpeckers in the blue oak forests of California's Sacramento Valley are sensitive to tree cutting and pasture expansion. Because these human activities will significantly change their living environment. In southern Arizona and New Mexico, the acorn woodpecker provides hollows for birds such as the chick owl, the purple cliff swallow, the Western Robin, and the purple green tree swallow.
Listed in the International Union for Conservation of Nature Red List of Threatened Species (IUCN) for 2016 ver 3.1 - Not Threatened (LC).
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