ムナホシアカゲラ 対 スジムネアオゲラ

The most reliable field mark to separate Freckle-breasted Woodpecker from Streak-breasted Woodpecker is overall plumage: Freckle-breasted shows a striking black-and-white barred back and red undertail, with buff underparts lightly streaked and barred, while Streak-breasted is a larger, heavier green woodpecker with a streaked breast but no strong barring above. Sex differences in crown color are key for Freckle-breasted, but not for Streak-breasted. In the field, focus on the upperpart pattern and underpart color, as well as overall size and structure. Both species can overlap in Southeast Asia, so careful attention to these marks is essential.

1. Upperparts pattern: Freckle-breasted Woodpecker has black upperparts with heavy white barring; Streak-breasted is greenish above with no strong barring. This is the fastest way to separate perched birds.
2. Underparts: Freckle-breasted shows buff underparts with light barring on the flanks and faint streaking on the sides; Streak-breasted has a streaked breast but lacks the buff tone and barring.
3. Undertail color: Freckle-breasted has a red undertail, which is absent in Streak-breasted.
4. Cheek pattern: Freckle-breasted displays whitish cheeks partly bordered by a black line, giving a more contrasting facial pattern than Streak-breasted.
5. Crown color (sex-specific): Male Freckle-breasted has a red crown with orange forehead; female has a black crown. Streak-breasted does not show this sexual dimorphism in crown color (based on available notes).
6. Size and structure: Streak-breasted is much heavier and bulkier (105 g) compared to the medium-sized, compact Freckle-breasted. Use this when birds are seen together or with familiar species for scale.
7. General coloration: Freckle-breasted is a pied woodpecker (black, white, and red), while Streak-breasted is predominantly greenish with less contrast.
8. Habitat context: If in mangrove forest, Streak-breasted is more likely, but both species can occur in lowland forest. Do not rely on habitat alone in overlapping regions.
9. Flight views: No distinctive age-specific wing or flight pattern marks are described for either species, so focus on overall color and size in flight.
10. Sexing in the field: Only Freckle-breasted shows clear sexual dimorphism in the crown; use this if head is visible.
11. Facial contrast: Freckle-breasted's face is more crisply marked, helpful in poor light or partial views.
12. Pitfalls: Immature birds are not described as differing from adults in these marks, so use adult field marks for all ages.
13. Overlap: In areas where both species occur, double-check upperpart and undertail color before making an ID.
14. When marks fail: If the bird is distant or backlit, size and structure may be the only clues—look for the bulkier shape of Streak-breasted versus the more compact Freckle-breasted.
15. Do not use: Song, detailed wing formula, or primary projection are not described and should not be relied upon for separation.

Streak-breasted Woodpecker is substantially heavier (about 105 g) and bulkier than Freckle-breasted Woodpecker, which is a medium-sized Dendrocopos with a more compact build. Expect Streak-breasted to look larger and more robust, especially in the field when seen side-by-side or compared to known species. Freckle-breasted will appear smaller and more agile.

• Adults (all seasons): Freckle-breasted Woodpecker is pied above, with black upperparts heavily barred with white, and a red undertail. Its underparts are buff with light barring on the flanks and slight streaking on the sides. The cheeks are whitish, partly bordered by a black line. Males have a red crown with an orange forehead, females have a black crown. Streak-breasted Woodpecker, by contrast, has greenish upperparts (not barred), and a breast that is streaked rather than barred; it lacks the red undertail and the strong black-and-white contrast of Freckle-breasted. The head pattern is less contrasting, and the cheeks are not as distinctly marked. Sex differences in crown color are not noted for Streak-breasted.
• Juvenile/immature: No age-specific upperwing or flight pattern marks are described for either species in the sources, so rely on the adult-type plumage contrasts above for all ages.

No specific behavioral differences are described in the sources. Both species are typical woodpeckers in foraging style, but Streak-breasted, being larger, may appear more deliberate or powerful in its movements, while Freckle-breasted may seem more nimble.

Freckle-breasted Woodpecker is found in a range of Southeast Asian countries (Indonesia, Laos, Myanmar, Thailand, Cambodia, Vietnam), while Streak-breasted Woodpecker is found from far southeastern Bangladesh to the central Malay Peninsula. Both use lowland forests, but Streak-breasted is also associated with mangrove forests. Overlap is possible in Thailand and the Malay Peninsula, so habitat alone is not diagnostic, but Streak-breasted may be more expected in mangroves.