Not as similar as thought: sexual dichromatism in Chimango caracaras is expressed in the exposed skin but not in the plumage.
SARASOLA, J.H., NEGRO, J.J., BECHARD, M.J. and LANUSSE, A. 2011. Not as similar as thought: sexual dichromatism in Chimango caracaras is expressed in the exposed skin but not in the plumage. Journal of Ornithology 152:473-479. Abstract: Many of the mechanisms involved in visual...