Species Profile
Acorn Woodpecker
Melanerpes formicivorus
Acorn Woodpecker
Quick Facts
Conservation
LCLeast ConcernAlso known as: California Woodpecker
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Appearance
The Acorn Woodpecker is a striking bird with a clown-like face. It features a black body, a white rump, and a distinctive red crown. Its forehead is white, and its piercing yellow eyes are surrounded by a white facial pattern. The bird's undersides are primarily white with black streaks.
Males and females are similar, but females have a black band between the red crown and white forehead. Juveniles resemble adults but have duller plumage and less distinct facial markings.
Identification & Characteristics
Colors
- Primary
- Black
- Secondary
- Yellow
- Beak
- Grey
- Legs
- Grey
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Acorn Woodpeckers are primarily found in oak and pine-oak woodlands throughout western North America, from Oregon to Colombia. They thrive in areas with a mix of oak species that provide a consistent acorn crop.
They are common in California, Arizona, and New Mexico. Some populations can also be found in urban areas with sufficient large trees, particularly in the western states.
Distribution
Diet
Behaviour
Acorn Woodpeckers are highly social, living in family groups of up to 15 individuals. They are famous for their cooperative acorn-storing behavior, creating 'granaries' in trees by drilling thousands of holes to store acorns.
These woodpeckers also engage in communal breeding, where several adults may contribute to raising a single brood.
Calls & Sounds
Nesting & Breeding
Acorn Woodpeckers nest in cavities, often using the same tree for many years. They practice cooperative breeding, with multiple adults contributing to nest building, incubation, and chick-rearing. The breeding season typically runs from April to September.
Clutches usually contain 3-7 eggs, which are incubated for about 11-14 days. Nestlings fledge after 30-32 days but may remain with the family group for several months, helping to raise subsequent broods.
Conservation
While currently listed as Least Concern, Acorn Woodpeckers face threats from habitat loss due to urban development and climate change.
Conservation efforts focus on preserving oak woodlands and maintaining suitable nesting sites. In some areas, artificial granary poles are being installed to support populations.
Birdwatching Tips
- Look for them in oak woodlands, especially near large, dead trees used as granaries
- Listen for their distinctive 'waka-waka' call
- Observe telephone poles and wooden structures in urban areas, which they sometimes use as substitute granaries
- Visit wildlife refuges or national parks in California or Arizona for prime viewing opportunities
Did You Know?
- A single Acorn Woodpecker granary tree can contain up to 50,000 acorn storage holes.
- They sometimes store water by punching rows of small holes in cactus plants.
- Acorn Woodpeckers have been known to store over 300 pounds of acorns in a single tree.
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