Species Comparisons • Backyard Identification
Chestnut-backed Chickadee vs Mountain Chickadee
Chestnut-backed Chickadee
Chestnut-backed Chickadee • Wikimedia Commons
Chestnut-backed Chickadee
Chestnut-backed Chickadee • Wikimedia Commons
Chestnut-backed Chickadee
Chestnut-backed Chickadee • Wikimedia Commons
Mountain Chickadee
Mountain Chickadee • Wikimedia Commons
Mountain Chickadee
Mountain Chickadee • Wikimedia Commons
Mountain Chickadee
Mountain Chickadee • Wikimedia Commons
Mountain Chickadee
Mountain Chickadee • Wikimedia Commons
Chestnut-backed Chickadee vs Mountain Chickadee (Poecile rufescens vs Poecile gambeli): The Complete Backyard Identification Guide
Field Summary
Quick Answer: The Fastest Way to Tell Them Apart
Two western chickadees, two instant marks. Three rules:
- Back: rich chestnut = Chestnut-backed; plain gray = Mountain.
- Eyebrow: white stripe through the black cap = Mountain; no stripe = Chestnut-backed.
- Map: foggy coast = Chestnut-backed; high dry conifers = Mountain.
At-a-Glance Comparison Table
The coastal chestnut chickadee and the mountain eyebrowed one, side by side. KEY rows separate fastest.
| Feature | Chestnut-backed Chickadee | Mountain Chickadee |
|---|---|---|
| Scientific Name | Poecile rufescens | Poecile gambeli |
| Length | 4.5 in (11.5 cm) | 5.25 in (13 cm) |
| Wingspan | 7.5 in (19 cm) | 8.5 in (21.5 cm) |
| Weight | 0.3–0.4 oz (8.5–12 g) | 0.4 oz (11 g) |
| Overall Shape | A tiny, big-headed chickadee with a short bill and restless energy | A gray chickadee of high western forests — look for the white eyebrow |
| Male Plumage KEY | Black cap and bib, white cheeks, rich chestnut back and chestnut flanks (sexes alike) | Black cap and bib, white cheeks, and a bold white eyebrow stripe through the cap (sexes alike) |
| Female Plumage | Identical to the male | Identical to the male |
| Bill Shape | Short, stubby, black | Short, stubby, black |
| Tail | Short, plain gray-brown | Short, plain gray |
| Core Range KEY | The wet conifer belt of the Pacific coast — Alaska to central California | Mountain conifer forests of the West — Rockies, Cascades, Sierra Nevada |
| Migration | Non-migratory; pairs join mixed winter flocks | Mostly resident; some drift downslope in winter |
| Feeder Presence | Suet, sunflower chips and peanut pieces; visits quickly and carries seeds away | Sunflower and suet in mountain and foothill yards |
| Favorite Foods | Insects and spiders from bark and foliage; seeds in winter | Insects gleaned from conifer needles and bark; seeds in winter |
| Song KEY | No clear whistled song; gives a husky “tsick-a-dee-dee” and thin “tsee-tsee” notes | A clear, whistled “fee-bee-bay” — three or four notes slurring downward |
| Flight Call | Hoarser and faster than other chickadees — “tsik-a-zee-zee” | A raspy “chick-a-dee-dee”, slower and hoarser than Black-capped |
| Population Trend | Stable within its coastal range | Stable; common in montane forest |
Male Field Marks, Side by Side
Chestnut-backed Chickadee — Male
Poecile rufescens
- Black cap, white cheeks and a rich chestnut back.
- Chestnut flanks set it off from every other chickadee.
- A bird of damp coastal forest and shaded yards.
Mountain Chickadee — Male
Poecile gambeli
- The only chickadee with a white eyebrow stripe.
- Gray back and pale gray flanks.
- A bird of pines, firs and spruces, often at elevation.
Female & Juvenile Marks, Side by Side
Chestnut-backed Chickadee — Female
Poecile rufescens
- Identical to the male.
- Excavates nest cavities in soft, rotting wood.
- Joins kinglets and nuthatches in winter flocks.
Mountain Chickadee — Female
Poecile gambeli
- Identical to the male.
- Nests in old woodpecker holes and nest boxes.
- The whistled song carries far through conifer forest.
Part-by-Part Anatomy Breakdown
Every part offers a check:
| Body Part | Chestnut-backed Chickadee | Mountain Chickadee |
|---|---|---|
| Back | Rich chestnut-rufous | Plain gray |
| Eyebrow | None — plain black cap | Bold white stripe through the cap |
| Flanks | Chestnut, deep in coastal birds | Pale gray |
| Cap Color | Dark brown-black | Black |
| Bib | Black, small | Black, small |
| Call | Hoarse, fast “tsick-a-dee-dee” | Slower, raspier “chick-a-dee-dee” |
| Song | No whistled song | Whistled “fee-bee-bay” |
Song & Call Comparison
Chestnut-backed Chickadee
Poecile rufescens
Calls: a hoarse, fast tsick-a-dee-dee, raspier than Black-capped.
Notes: thin, high tsee-tsee contact calls in foraging flocks.
Chestnut-backed Chickadee voice • Wikimedia Commons
Mountain Chickadee
Poecile gambeli
Song: a whistled fee-bee-bay, one or two notes lower than Black-capped.
Calls: a slow, raspy chick-a-dee-dee.
Mountain Chickadee voice • Wikimedia Commons
Range & Seasonal Presence
The Chestnut-backed Chickadee lives in the wet conifer belt along the Pacific coast from Alaska to central California — hemlock, cedar and shaded yards.
The Mountain Chickadee is the chickadee of interior western mountains — pines, firs and spruces from the Rockies to the Cascades and Sierra. They meet where coastal ranges rise.
Feeder Behavior & Favorite Foods
- Chestnut-backed Chickadee: suet, sunflower chips and peanuts in fog-belt yards; grab-and-go visits.
- Mountain Chickadee: sunflower and suet in mountain cabins and foothill towns.
- Behavior: both snatch one seed and fly to a perch to hammer it open.
- Winter flocks: both join kinglets, nuthatches and creepers — check every chickadee in the flock.
Temperament & Flock Behavior
Chestnut-backed Chickadees are acrobatic gleaners of damp forest, often high in hemlocks.
Mountain Chickadees work conifer tips methodically and whistle their sweet song through the pines.
6-Step Backyard ID Checklist
- Back. Chestnut = Chestnut-backed; gray = Mountain.
- Eyebrow. White stripe = Mountain; none = Chestnut-backed.
- Flanks. Chestnut = Chestnut-backed; pale gray = Mountain.
- Song. Whistled “fee-bee-bay” = Mountain; none = Chestnut-backed.
- Call. Fast and hoarse = Chestnut-backed; slower, raspier = Mountain.
- Map. Coast = Chestnut-backed; interior mountains = Mountain.
Frequently Asked Questions
How do you tell a Chestnut-backed from a Mountain Chickadee?
Chestnut-backs have a rich chestnut back and flanks with no eyebrow. Mountain Chickadees are plain gray with a bold white eyebrow stripe through the black cap.
Which chickadee has a white eyebrow?
The Mountain Chickadee — the only North American chickadee with that stripe.
Do their ranges overlap?
Yes — where coastal mountains rise in the Northwest, both can occur; check the back color and eyebrow.
Which one whistles a song?
The Mountain Chickadee — a sweet “fee-bee-bay.” The Chestnut-backed has no whistled song, only hoarse calls.
Are both sexes alike?
Yes — in both species males and females share the same plumage.
What feeder foods work?
Suet, sunflower chips and peanut pieces for both; they carry seeds off to eat or cache.
Key Takeaways
- Back: Chestnut = Chestnut-backed; gray = Mountain.
- Eyebrow: White stripe = Mountain; none = Chestnut-backed.
- Flanks: Chestnut = Chestnut-backed; gray = Mountain.
- Song: Whistled = Mountain; none = Chestnut-backed.
- Range: Coast = Chestnut-backed; interior = Mountain.
- Flocks: Check every chickadee in winter flocks.