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Relationship between aspect ratio and the hand-wing index in 35 species of Furnariidae. Regression line from a phylogenetic generalized least-squares model (R2 = 0.66, F = 68.4, d.f. = 1, p < 0.001): aspect ratio = 0.045 (±0.005) × hand-wing index + 3.7 (±0.01).
