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Scatter plot comparing body size (g) with volume of telencephalon (mm3) in Old and New World corvids. The regression line is the line of best fit passing through the origin. Old World corvids (crow, rook, jackdaw, magpie, chough, red-billed blue magpie, European jay, Clark's nutcracker) are represented with black symbols. New World corvids (western scrub-jay, pinyon jay, Mexican jay) are represented with white symbols. Data taken from Basil et al. (1996) and Healy & Krebs (1992).
