Extended parental provisioning and variation in vertebrate brain sizes
Fig 5
Brain–body allometries among altricial and precocial birds.
Violin plots of slopes of the brain–body allometries of altricial (gray bars) and precocial (white bars) orders and families of birds. Data are taken from [104]. Orders or families were included when >5 species were available. Horizontal bars represent the median, red diamonds the mean, and boxes enclose the central 50% percentile range. The difference at the family level is significant (t = 2.60, DF = 26.46, p < 0.02). Sample sizes for altricial birds: 15 orders and 38 families; for precocial birds: 8 orders and 17 families.