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Distribution of variation in relative egg mass (corrected for adult mass) among 72 passerine species studied at three sites: tropical Venezuela, subtropical Argentina, and north temperate Arizona. Relative egg masses for species with a clutch size of two eggs (i.e., mean clutch size >1.9 and <2.1 eggs) are indicated by black bars to illustrate that the full range of variation in relative egg mass exists for a constant clutch size.
