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The most reliable field mark between Maroon-chested Ground Dove and Ruddy Quail-Dove is the presence of two broad dark wing bars on the folded wing of the Maroon-chested Ground Dove (especially in adult males), which are absent in Ruddy Quail-Dove. Adult male Maroon-chested Ground Doves show a striking combination of grayish white face and dark purple breast, while Ruddy Quail-Doves are overall rust-colored with a lighter brown breast and facial mask. Females and juveniles of both species are browner, but Maroon-chested Ground Dove females have a cinnamon face and less distinct wing bars, while Ruddy Quail-Doves remain more uniformly rufous. Both are ground-dwelling doves of the Neotropics, but their wing and face patterns are key for separation at all ages.

1. Look for wing bars: Adult male Maroon-chested Ground Doves show two broad dark bars on the folded wing, which are absent in Ruddy Quail-Dove of any age or sex. This is the single best field mark when visible.
2. Face color in males: Maroon-chested Ground Dove males have a grayish white forehead, face, and chin, while Ruddy Quail-Dove males have a rust-colored face with a pale undereye stripe. If the face is pale and contrasts with the rest of the head, suspect Maroon-chested.
3. Breast color: Maroon-chested Ground Dove males have a dark purple breast, sharply set off from the gray belly and vent. Ruddy Quail-Dove's breast is a lighter brown, blending into the rest of the plumage.
4. Upperparts and wings: Maroon-chested Ground Dove males have blue-gray upperparts and wings, while Ruddy Quail-Dove is uniformly rust-colored above and on the wings.
5. Tail pattern: Maroon-chested Ground Dove has central gray tail feathers, with outermost ones white and intermediates grayish white, creating a contrasting tail pattern. Ruddy Quail-Dove's tail is not described as contrasting and is likely more uniform.
6. Female and juvenile confusion: Female and juvenile Maroon-chested Ground Doves are brown overall with a cinnamon face, and may show faint wing bars. Ruddy Quail-Dove females and juveniles are more uniformly rufous or rust-brown without any hint of wing bars or cinnamon face.
7. Eye and orbital skin: Maroon-chested Ground Dove has an orange eye with bare yellow skin around it, which can be a subtle but helpful mark if seen well. Ruddy Quail-Dove's eye and orbital skin are not described as distinctive.
8. Size and structure: Ruddy Quail-Dove is generally larger and bulkier, but size overlap means this is only a supporting mark.
9. Facial mask: Ruddy Quail-Dove has a distinctive facial mask and pale undereye stripe, which is not present in Maroon-chested Ground Dove.
10. Plumage gloss: Not described for either species, so do not rely on iridescence or gloss for separation.
11. Habitat and range: Both can occur in similar habitats, so do not rely on context alone unless outside the known range of one species.
12. Flight views: In flight, look for the wing bars on Maroon-chested Ground Dove (especially in males and sometimes females/juveniles); their absence points to Ruddy Quail-Dove.
13. Sexual dimorphism: Maroon-chested Ground Dove shows strong sexual dimorphism (males gray-faced, females cinnamon-faced), while Ruddy Quail-Dove is more uniformly rust-colored in both sexes.
14. Seasonal variation: No seasonal plumage differences are described for either species, so marks are reliable year-round.
15. Voice: No vocal differences are described in the sources, so do not rely on calls or songs for separation.

Maroon-chested Ground Dove is slightly smaller and more compact, with males measuring 18–24 cm and females 19–22 cm in length, and both sexes weighing 89–95 g. Ruddy Quail-Dove is generally larger, ranging from 19–28 cm in length, but weight is not specified. In the field, Ruddy Quail-Dove may appear bulkier and longer-bodied, but size overlap can make this unreliable at a distance or without direct comparison.

• Juvenile and Female: Maroon-chested Ground Dove juveniles and females are brown overall with a cinnamon face, and the wing bars are less distinct but still sometimes visible. Ruddy Quail-Dove juveniles and females are uniformly rust-brown with a lighter brown breast and facial mask, lacking any wing bars.
• Adult Male: Maroon-chested Ground Dove males have a grayish white forehead, face, and chin, a dark purple breast, blue-gray upperparts and wings with two broad dark wing bars, and a gray-to-white tail pattern. Ruddy Quail-Dove males are rust-colored above and on the face, with a lighter brown breast, rump, and a pale undereye stripe, but no wing bars.
• Tail: Maroon-chested Ground Dove shows a gray-to-white tail pattern, with the outermost feathers white, while Ruddy Quail-Dove's tail is not specifically described but is not noted as contrasting.
• Eye and Facial Skin: Maroon-chested Ground Dove has an orange eye with bare yellow skin around it; this is not described for Ruddy Quail-Dove.

Both species are ground-dwelling and secretive, often foraging in dense undergrowth. There are no specific behavioral differences described in the sources that are diagnostic for field separation.

Both species occur in Central and South America and can overlap in range, especially in montane and lowland forests. Maroon-chested Ground Dove is associated with the American Cordillera, while Ruddy Quail-Dove is more widespread, including the West Indies and as a vagrant in southern Florida and Texas. Habitat alone is not diagnostic where ranges overlap.