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The bitter taste receptor gene repertoires of 48 birds and their dietary preferences. Species tree and divergence times were taken from a recent study (Jarvis et al. 2014). Dietary information was from the literature and the Animal Diversity Web (supplementary table S1, Supplementary Material online). C, carnivore; I, insectivore; F, frugivore; Fo, folivore; G, granivore; N, nectarivore; O, omnivore.
