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(a) Phylogeny of molothrine cowbirds based on Johnson & Lanyon (1999) with pictures of study skins to illustrate plumage colour differences and micrographs (2500×) of representative feather barbules from belly feathers. (b) Subset of the phylogeny of grackles and allies based on Johnson & Lanyon (1999) with pictures of study skins to illustrate plumage colour differences and micrographs (2500×) of representative feather barbules from belly feathers.
