This data set gives the birth weight of for 40 bird families classified in 15 orders and regrouping a total of 184 individuals.
A dataframe with 184 rows with three columns: "weight" (the weight in grammes), "family" (a factor with 40 levels) and "order" (a factor with 15 levels).
An Age: The Animal Ageing and Longevity Database, http://genomics.senescence.info/species/
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