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Frequency distribution of bacterial species richness in blue tits, as determined by the bacterial species richness recorded within individual adults (A) and nestlings (B). There was no significant difference in bacterial species richness between adult male and female blue tits (F1,52 = 0.02, P = 0.888) nor between nestlings aged 7 or 14 days after hatching (F1,174 = 0.03, P = 0.859).
