Acorn Woodpeckers are medium-sized woodpeckers with straight, spike-like bills and stiff, wedge-shaped tails used for support as the birds cling to tree trunks.
Smaller than a Northern Flicker; larger than a Downy Woodpecker.robin-sized
- Both Sexes
- Length: 7.5-9.1 in (19-23 cm)
- Weight: 2.3-3.2 oz (65-90 g)
- Wingspan: 13.8-16.9 in (35-43 cm)