アカエリバト 対 オビオバト

要点

The most reliable field mark to separate Scaly-naped Pigeon from Band-tailed Pigeon is the presence of a thin white collar on the nape in adult Band-tailed Pigeon, which Scaly-naped never shows. In flight or perched, Band-tailed also shows a distinctive pale tail tip with a dark subterminal band, while Scaly-naped’s tail is uniformly dark. Juvenile Band-tailed Pigeons can appear scaly above, but lack the white collar and neck iridescence, potentially confusing them with Scaly-naped, though the tail pattern and bill/leg color still help. Both are large, gray pigeons, but details of bare skin color, bill, and subtle plumage tones are key in close views. Habitat and range are also strong clues: Scaly-naped is Caribbean, Band-tailed is continental Americas.

識別のコツ

1. White nape collar (adult Band-tailed only): Look for a thin, crisp white band on the nape—diagnostic for adult Band-tailed Pigeon and never present on Scaly-naped. In poor light or on juveniles, this mark may be absent or hard to see.
2. Tail pattern in flight or perched: Band-tailed Pigeon shows a pale gray tail tip with a contrasting dark subterminal band; Scaly-naped Pigeon’s tail is uniformly dark. This mark is visible in all ages and is especially useful in flight.
3. Neck coloration: Scaly-naped Pigeon has a maroon or reddish neck with a scaly appearance on the nape; Band-tailed has a purple-gray breast and green iridescence on the neck (adults), but not the maroon tone or scaly texture.
4. Bare skin around eye: Scaly-naped shows a bare patch around the eye, reddish in males and more yellow in females; Band-tailed lacks this feature, instead having a clean, feathered face.
5. Bill and leg color: Band-tailed Pigeon has a yellow bill and yellow feet (northern group may have a black tip to the bill); Scaly-naped has a red base to the bill with a pale tip, and red legs.
6. Juvenile confusion: Juvenile Band-tailed can look scaly above, but always lacks the white collar and has the pale tail tip with dark band; Scaly-naped juveniles resemble adults and never show the tail pattern or white collar.
7. Overall plumage tone: Scaly-naped is slate gray with a maroon neck, while Band-tailed is gray with a faint pinkish or purple cast on the breast (especially in males), and a nearly white belly.
8. Size and structure: Both are large, robust pigeons. Band-tailed may appear slightly longer-winged and longer-tailed, but this is subtle and not reliable on its own.
9. Habitat and range: Scaly-naped is Caribbean; Band-tailed is continental Americas. If seen outside the expected range, reconsider the ID.
10. Group behavior: Band-tailed may form larger flocks, especially at food sources or mineral licks; Scaly-naped is more often solitary or in small groups.
11. Bill shape and thickness: Both have robust bills, but Band-tailed’s is thicker-based and more obviously yellow.
12. Underpart color: Band-tailed shows a nearly white belly contrasting with the pinkish breast; Scaly-naped is more uniformly dark below.
13. Sex differences: Scaly-naped females may have more yellowish bare skin around the eye, but this is subtle and not always visible.
14. Flight style: Both are strong fliers, but Band-tailed may appear longer-winged and more buoyant; this is a minor point compared to plumage marks.
15. Mixing with other species: Scaly-naped may mix with Rock Dove, Eared Dove, or Zenaida Dove in the Caribbean, but Band-tailed is generally with its own kind or other continental pigeons.

大きさ

Both species are among the largest pigeons in their respective ranges and are similar in overall bulk. Scaly-naped Pigeon averages about 312 g [wikidata], while Band-tailed Pigeon ranges from 226–460 g, with some overlap but Band-tailed potentially heavier at the upper end [wikipedia]. Both are 33–40 cm (13–16 in) long, so size alone is not a reliable separator in the field. Both look large and robust, though Band-tailed may appear slightly longer-winged and longer-tailed in flight.

羽色

• Juveniles: Juvenile Band-tailed Pigeons have pale feather edges above, giving a scaly appearance that can recall Scaly-naped Pigeon. However, juveniles lack the white nape collar and green neck iridescence of adults, and still show the pale tail tip with a dark band. Scaly-naped juveniles resemble adults but always lack the white collar and have a more uniform dark tail.

• Adults: Adult Band-tailed Pigeons are mostly gray with a faint pinkish cast on the breast (especially in males), a thin white nape collar, green iridescence on the neck, and a pale tail tip with a dark subterminal band. Scaly-naped Pigeons are slate gray with a maroon neck, scaly nape, and uniformly dark tail. The bare skin around the eye is reddish in males and more yellow in females for Scaly-naped, while Band-tailed has yellow bill and feet. Scaly-naped shows red legs and base of bill, with a pale bill tip.

行動

Both species are wary and often flush when approached. Scaly-naped Pigeons are usually seen alone or in small groups, sometimes mixing with other doves. Band-tailed Pigeons can form small flocks, especially at food sources, and may nest in loose colonies. Both feed in trees and on the ground, but Band-tailed is more likely to be seen in larger flocks during migration or at mineral licks.

生息環境

Scaly-naped Pigeon is found throughout the Caribbean, especially in the Greater and Lesser Antilles, favoring rainforests but also occurring in drier woodlands and near settlements. Band-tailed Pigeon ranges widely in the Americas, from western North America through Central America and into the Andes, preferring forests with abundant fruit or acorns. Band-tailed is absent from the Caribbean. If you are in the Caribbean, Band-tailed is extremely unlikely; if you are in continental North or South America, Scaly-naped is not expected.