CZ:Ref:DOI:10.1086/589461

Sol, D. & T.D. Price (2008), "Brain Size and the Diversification of Body Size in Birds", Am Nat 172: 170-177, DOI:10.1086/589461 ^[e]

Based on data about brain size and body size in 120 families of birds, this study shows by means of path analysis that about 12% of within-family body size disparity can be explained by the average residual brain size within that family. Based on observations that brain size correlates with a number of cognitive measures, it is then concluded that behaviour might contribute to evolutionary diversification.