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The most reliable field mark to separate Scaly-naped Pigeon from White-crowned Pigeon is the presence or absence of a white crown: adult White-crowned Pigeons always show a distinct pale or white crown patch, while Scaly-naped Pigeons never do. Juvenile White-crowned Pigeons lack a full white crown but are paler-headed than Scaly-naped, which instead shows a scaly pattern on the nape. In flight or perched, look for the scaly maroon nape and red eye skin of Scaly-naped versus the smooth, dark plumage and white crown of White-crowned. Both species are large, dark Caribbean pigeons, but the Scaly-naped is bulkier with a more robust build and heavier bill. Habitat overlap is possible, but White-crowned favors mangroves and coastal areas, while Scaly-naped is more often inland or in drier woodlands.

1. White crown patch (adults): Only adult White-crowned Pigeons show a distinct white or grayish-white crown; Scaly-naped Pigeons never have a white crown at any age. This is the single most reliable field mark.
2. Juvenile head pattern: Juvenile White-crowned Pigeons lack a full white crown but have a plain, grayish-brown head with a few pale crown feathers; juvenile Scaly-naped Pigeons have a maroon-washed neck and scaly nape, never a pale crown.
3. Nape pattern: Scaly-naped Pigeons of all ages show a scaly pattern on the nape, visible as pale feather edges; White-crowned Pigeons have a smooth nape with no scaly texture.
4. Neck color: Scaly-naped Pigeon has a maroon or reddish wash around the neck, especially on the nape; White-crowned Pigeon is uniformly dark slate to blackish with only a subtle iridescent collar in good light.
5. Eye skin and iris: Scaly-naped Pigeon has a bare patch of skin around the eye (red in males, yellowish in females); White-crowned Pigeon has a white iris (adults) and no prominent bare eye skin.
6. Bill color: Scaly-naped Pigeon has a red base to the bill with a pale tip; White-crowned Pigeon has a red bill with a pale tip, but this is less robust and the bill appears slimmer overall.
7. Leg color: Both species have reddish legs, but Scaly-naped's are more robust and match the bill base.
8. Body shape: Scaly-naped Pigeon is bulkier, with a thicker neck and heavier build; White-crowned is slimmer, with a longer, more squared tail and less chunky appearance.
9. Flight profile: White-crowned Pigeon appears more streamlined in flight, with a longer tail and less pronounced neck; Scaly-naped looks heavier and more compact.
10. Plumage gloss: White-crowned Pigeon's iridescent collar is only visible in strong light and is less useful as a field mark; Scaly-naped lacks this feature.
11. Habitat context: In mangroves or coastal islands, especially in Florida, expect White-crowned; in inland rainforests or drier woodlands, especially near settlements, expect Scaly-naped.
12. Group behavior: Scaly-naped is more often solitary or in small groups, sometimes with other doves; White-crowned is more likely in pairs or small flocks, especially at fruiting trees.
13. Voice: If heard, White-crowned gives a deep coo-cura-coo; Scaly-naped's call is less distinctive and not a reliable separator.
14. Sex differences: Female White-crowned Pigeons have a duller, grayish-white crown compared to the bright white in males; female Scaly-naped Pigeons may have a yellower eye skin but otherwise similar to males.
15. Pitfalls: Immature White-crowned Pigeons can be confused with Scaly-naped due to lack of white crown, but always lack the scaly nape and maroon neck wash. Scaly-naped never shows any pale or white crown at any age.

Scaly-naped Pigeon is notably heavier (body mass ~312 g) and generally appears bulkier and more robust than White-crowned Pigeon, which is slimmer and less chunky (White-crowned's mass ranges up to 301 g, but is usually lighter). Both are similar in length (Scaly-naped: 14–16 in; White-crowned: 11–14 in), but White-crowned has a relatively longer, more squared tail and a less stocky impression. In direct comparison, expect Scaly-naped to look larger-bodied and thicker-necked, especially when perched.

• Juveniles: Juvenile White-crowned Pigeons are duller, with a grayish-brown tone, lack the white crown, and have no nape pattern; their head is plainer than Scaly-naped, which never shows a white crown at any age but instead has a scaly maroon nape even in immatures. Juvenile Scaly-naped Pigeons are overall slate gray with a scaly nape and maroon neck wash, lacking any pale crown.
• Adults: Adult White-crowned Pigeons show a crisp white (male) or grayish-white (female) crown patch, a smooth dark slate to nearly black body, and a subtle iridescent collar only visible in good light. Scaly-naped Pigeon adults have a maroon-washed neck, scaly nape, and a bare red or yellowish eye-ring, with no white crown. The Scaly-naped's bill base and legs are red, while White-crowned has a red bill with a pale tip and white iris (adults).

Both species are wary and quick to flush, but Scaly-naped Pigeons are more often seen alone or in small groups, sometimes mixing with other doves. White-crowned Pigeons are usually seen in pairs or small flocks, especially near fruiting trees or mangroves. Both feed on fruits and seeds, often high in trees, but White-crowned is more likely to be encountered in mangrove or coastal settings, sometimes commuting long distances between feeding and nesting sites.

Scaly-naped Pigeon prefers rainforests and drier lowland woodlands, and is locally common near human settlements throughout the Caribbean (except Jamaica and the Bahamas). White-crowned Pigeon is more tied to coastal and mangrove habitats, especially for nesting, but will travel inland to feed. In Florida, White-crowned is almost exclusively found in mangroves and coastal islands, while Scaly-naped is absent. In the Greater and Lesser Antilles, both may overlap, but White-crowned is more coastal and Scaly-naped more widespread inland.

White-crowned Pigeon's call is a loud, deep coo-cura-coo or coo-croo, typical of Patagioenas pigeons. No distinctive vocalization is described for Scaly-naped Pigeon in the provided notes, and their calls are generally less diagnostic for separation in the field.