Species Comparisons • Backyard Identification
Acorn Woodpecker vs Nuttall’s Woodpecker
Acorn Woodpecker
Acorn Woodpecker • Wikimedia Commons
Acorn Woodpecker
Acorn Woodpecker • Wikimedia Commons
Acorn Woodpecker
Acorn Woodpecker • Wikimedia Commons
Acorn Woodpecker
Acorn Woodpecker • Wikimedia Commons
Nuttall’s Woodpecker
Nuttall’s Woodpecker • Wikimedia Commons
Nuttall’s Woodpecker
Nuttall’s Woodpecker • Wikimedia Commons
Nuttall’s Woodpecker
Nuttall’s Woodpecker • Wikimedia Commons
Nuttall’s Woodpecker
Nuttall’s Woodpecker • Wikimedia Commons
Acorn Woodpecker vs Nuttall’s Woodpecker (Melanerpes formicivorus vs Dryobates nuttallii): The Complete Backyard Identification Guide
Field Summary
Quick Answer: The Fastest Way to Tell Them Apart
California oaks host both — one loud and colonial, one quiet and solitary. Three rules:
- Face: white forehead and throat with a black mask and pale staring eye = Acorn Woodpecker; horizontal black-and-white face stripes with a dark eye = Nuttall’s.
- Back: solid glossy black = Acorn; barred black-and-white “ladder-back” = Nuttall’s.
- Size and scene: bigger, in noisy colonies around acorn-stuffed granary trees = Acorn; smaller, alone or in pairs working oak branches = Nuttall’s.
At-a-Glance Comparison Table
The two oak-country woodpeckers, side by side. KEY rows separate fastest.
| Feature | Acorn Woodpecker | Nuttall’s Woodpecker |
|---|---|---|
| Scientific Name | Melanerpes formicivorus | Dryobates nuttallii |
| Length KEY | 9.0 in (23 cm) | 7.5 in (19 cm) |
| Wingspan | 16.1 in (41 cm) | 13.0 in (33 cm) |
| Weight | 2.3–3.2 oz (65–90 g) | 1.1–1.6 oz (30–45 g) |
| Overall Shape | Medium woodpecker with a bold black-and-white “clown” face | Small woodpecker with a barred “ladder-back” |
| Male Plumage KEY | Black body with white rump and wing patches; white forehead and throat, black mask, yellow-white eye, red crown meeting the white forehead | Black-and-white barred back, white face with black stripes, dark eye; red on the rear crown and nape |
| Female Plumage | Like the male but the red crown is set farther back, separated from the white forehead by a black band | Like the male but with a black crown — no red |
| Bill Shape | Straight, stout, gray-black | Short, straight, dark |
| Tail | Black, stiff, braced against bark | Black with white-spotted outer feathers, stiff |
| Core Range | Oak woodlands of the Pacific coast and Southwest — Oregon and California to Arizona, New Mexico and west Texas | California (and Baja) oak woodlands — a near-endemic of the state |
| Migration | Non-migratory; colonies defend granary trees year-round | Non-migratory resident |
| Feeder Presence KEY | Visits suet feeders and birdbaths in oak-country yards; colonies may adopt a feeder pole as a granary | Occasional suet visitor in oak-country yards; more often heard drilling in the trees overhead |
| Favorite Foods | Acorns stored by the thousand in granary trees; insects caught in flight; sap | Mostly insects — beetle larvae and ants from oak bark; little seed |
| Song KEY | No true song — raucous “waka-waka-waka” calls instead | No true song — a sharp rattle instead |
| Flight Call | The laughing “waka-waka” chorus of a colony | A sharp “pik” and a descending rattle |
| Population Trend | Stable where mature oaks remain | Stable but tied to California oaks |
Male Field Marks, Side by Side
Acorn Woodpecker — Male
Melanerpes formicivorus
- Clown face: white forehead and throat, black mask, pale staring eye.
- Red crown touches the white forehead (male).
- White rump and wing patches flash in flight.
Nuttall’s Woodpecker — Male
Dryobates nuttallii
- Barred black-and-white back — no white back stripe.
- Red confined to the rear crown and nape.
- California oak specialist; dark eye in a striped face.
Female & Juvenile Marks, Side by Side
Acorn Woodpecker — Female
Melanerpes formicivorus
- Like the male, but a black band separates the red crown from the white forehead.
- Found in noisy family colonies around granary trees.
- Checks acorn stores constantly through fall and winter.
Nuttall’s Woodpecker — Female
Dryobates nuttallii
- Like the male but the crown is all black.
- Works thin outer branches larger woodpeckers skip.
- Almost never leaves California oaks.
Part-by-Part Anatomy Breakdown
Face and back pattern separate them at any distance:
| Body Part | Acorn Woodpecker | Nuttall’s Woodpecker |
|---|---|---|
| Face | White forehead/throat, black mask, pale yellow-white eye | Black-and-white striped face, dark eye |
| Crown (M) | Red meets the white forehead | Red confined to the rear crown and nape |
| Back | Solid glossy black | Barred black-and-white |
| Size | 9.0 in, jay-sized | 7.5 in, barely bigger than a Downy |
| Wings in Flight | Black with big white patches | Barred, spotted with white |
| Underparts | Black breast over streaked pale belly | Whitish with fine dark barring |
| Signature Sound | Laughing “waka-waka” colony chorus | Sharp “pik” and a dry rattle |
Song & Call Comparison
Acorn Woodpecker
Melanerpes formicivorus
Voice: the raucous, laughing waka-waka-waka given by the whole colony.
Drumming: short, even rolls on dead limbs — and on granary poles in yards.
Acorn Woodpecker voice • Wikimedia Commons
Nuttall’s Woodpecker
Dryobates nuttallii
Voice: a sharp pik and a descending dry rattle.
Drumming: short, rapid rolls on dead oak limbs.
Nuttall’s Woodpecker voice • Wikimedia Commons
Range & Seasonal Presence
The Acorn Woodpecker occupies oak woodlands from Oregon and California through the southwestern mountains — colonies live where acorns can be harvested and stored.
The Nuttall’s Woodpecker is a near-endemic of California (barely into Baja) — the small woodpecker of the state’s oak woodlands, riverside groves and shaded suburbs. The two share California oaks everywhere the Acorn occurs.
Feeder Behavior & Favorite Foods
- Acorn Woodpecker: colonies mob suet feeders and birdbaths; expect groups, not singles, and acorns wedged into every wooden structure nearby.
- Nuttall’s Woodpecker: a modest suet visitor — usually alone, quiet, and quick; more often detected by its rattle from the oaks overhead.
- Best foods: suet for both; the Acorn also takes cracked corn and nuts.
- Habitat over feeders: both are oak birds first — yards under mature oaks get both species without any feeder at all.
Temperament & Flock Behavior
Acorn Woodpeckers are boisterous and communal — family clans chatter, chase and cooperatively tend their granaries all day.
Nuttall’s Woodpeckers are quiet loners — pairs slip through oak canopies working thin branches that bigger woodpeckers ignore.
6-Step Backyard ID Checklist
- Face pattern. Clown face, pale eye = Acorn; striped face, dark eye = Nuttall’s.
- Back. Solid black = Acorn; barred = Nuttall’s.
- Size. Jay-sized = Acorn; sparrow-plus = Nuttall’s.
- Male’s red. Red reaching the forehead = Acorn; red only at the back of the head = Nuttall’s.
- Numbers. A chattering clan = Acorn; a lone bird = Nuttall’s.
- Call. “Waka-waka” = Acorn; sharp rattle = Nuttall’s.
Frequently Asked Questions
How do you tell an Acorn Woodpecker from a Nuttall’s Woodpecker?
Acorn Woodpeckers are larger with a clown face — white forehead and throat, black mask, pale eye — and a solid black back. Nuttall’s is smaller with a black-and-white striped face, dark eye and barred back.
Where do Nuttall’s Woodpeckers live?
Almost entirely in California (with a small extension into Baja) — oak woodlands, riverside groves and shaded suburbs. It is the state’s near-endemic woodpecker.
Which one stores acorns?
Only the Acorn Woodpecker — colonies drill granary trees full of individual acorn holes. Nuttall’s eats mostly insects from oak bark.
Are Acorn Woodpeckers always in groups?
Almost always — they live in cooperative family clans of up to a dozen or more birds around a shared granary tree. Nuttall’s Woodpeckers live as solitary pairs.
Do Nuttall’s Woodpeckers come to feeders?
Occasionally for suet, usually alone and quietly. Acorn Woodpeckers arrive at suet in noisy groups and may also take cracked corn.
How do their calls differ?
The Acorn Woodpecker gives the famous laughing “waka-waka-waka” in colony choruses. Nuttall’s gives a sharp “pik” and a short dry rattle — much quieter birds overall.
Key Takeaways
- Face: Clown face + pale eye = Acorn; striped face + dark eye = Nuttall’s.
- Back: Solid black = Acorn; barred = Nuttall’s.
- Size: Jay-sized = Acorn; downy-plus = Nuttall’s.
- Male Red: Red to the forehead = Acorn; rear crown only = Nuttall’s.
- Society: Noisy granary clans = Acorn; solitary pairs = Nuttall’s.
- Range: Both live in California oaks; Nuttall’s lives almost nowhere else.