Acorn Woodpecker illustration
Birdsong field guide

Acorn Woodpecker

Melanerpes formicivorus

A medium-sized, social woodpecker recognized by its distinct clown-like facial markings and unique communal food-storing behavior.

What it sounds like

A loud, nasal, and rhythmic 'waka-waka-waka' or 'ja-cob, ja-cob' call.

Reference call, compare with what you heard
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Rec. Ed Pandolfino · United StatesCC BY-NC-SAXeno-canto

Field notes

  • They drill thousands of precisely sized holes into 'granary trees' to store acorns, which they defend collectively.
  • They live in complex social groups where multiple individuals help raise the offspring of breeding adults.
  • Acorn Woodpeckers are skilled flycatchers, often launching from high perches to capture insects in mid-air.
  • Their mating system is highly complex, frequently involving cooperative polyandry and polygynandry within the group.
  • Granary trees are passed down through generations, with some trees containing over 50,000 individual storage holes.
Habitat
Oak and pine-oak woodlands featuring multiple oak species to ensure stable annual acorn crops.
Range
Coastal and montane regions from Oregon and California through Mexico and Central America to Colombia.

Similar & commonly confused birds

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