For both genders, house finches have streaked undertail coverts while purple finches are plain white underneath their tails. Female purple finches, meanwhile, have sharply defined streaks and a well-marked face with a distinct whitish eyebrow and fine streaks on the crown. Female house finches have blurry streaks on their underparts and a relatively plain face. Markings: The sharpness of the markings is key for distinguishing these female finches.House finches can also show orange or yellow color variants, while similar variants are very rare in purple finches. The red on house finches is more confined to the forehead, brow, and upper chest.
Purple finches also have much more extensive red extending on the crown, nape, back, chest, cheeks, and flanks. House finches are a classic red or red-orange like a ripe strawberry, while purple finches are more of a dark pink or rosy hue similar to a raspberry or red wine. Plumage Color: The males of both these finches are red and brown, but there are many different shades of red.Overall, purple finches are slightly larger than house finches, but if the birds are seen at different distances, size can also be hard to judge. Body shape can be distorted by a bird's posture and movement, however, so it is important to observe birds in a casual, relaxed perch pose to accurately determine shape. Body Shape: House finches are typically more slender than purple finches, which often look stocky with a larger head and thicker neck in proportion to their body size.The Spruce Home Improvement Review Board.
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