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Means and 95 per cent confidence intervals for cranial (cran), humeral (hum) and femoral (fem) density in (a) birds, (b) bats and (c) rodents. Sample sizes in parentheses. Stars for bats and rodents indicate weighted means of bone density for each group. The mean of bone density for birds is based on 31 specimens for which density was available for all three skeletal elements, and is accompanied by 95 per cent confidence intervals.
