Table 1. Descriptive statistics for log₂ M _adult (kg) of Mesozoic dinosaur, mammal, and bird taxa, and for living mammals and birds.

Group	n	Median	Min	Max	Q25	Q75	Skewness	SW-W	SW-p
Non-avian dinosaurs
All taxa	123	10.5	0	17.2	7	13.3	−0.491	0.959	<0.001
Ornithischia	43	9.8	0	14.5	6.7	11.4	−0.826	0.93	0.012
Sauropodomorpha	45	13.7	4.6	17.2	12.7	14.8	−1.599	0.862	<0.001
Theropoda	35	7.3	1.1	12.7	4.3	10	−0.008	0.952	0.127
Mammals
Mesozoic	80	−3.6	−7.2	4.1	−5	−2.4	1.043	0.921	<0.001
Modern
Extant	3277	−3.3	−9.2	11.9	−5.3	0.1	0.8	0.939	<0.0001
Incl. recent extinctions	3501	−2.9	−9.2	13.3	−5.2	1.2	0.9	0.928	<0.0001
Excl. airborne groups	2619	−2.3	−9.2	11.9	−4.5	1.3	0.7	0.953	<0.0001
Extant herbivores	223	5.8	1.3	11.9	4.3	7.4	0.2	0.990	0.110
Extant carnivores	258	1.8	−3.3	10.6	0.5	3.8	0.6	0.959	<0.0001
Birds
Mesozoic	31	−4	−9	1.3	−6.2	−1.6	0.169	0.951	0.168
Extant	9991	−4.8	−9.0	6.8	−6.1	−2.9	0.827	0.999	<0.0001

n = number of taxa; SW = Shapiro Wilks’ test for normal distribution.

Modern mammal subgroups: Incl. recent extinctions = data includes species that went extinct in the Late Pleistocene; Excl. airborne groups = data excludes the airborne mammalian orders Chrioptera (bats) and Dermoptera (colugos); carnivores = members of the Order Carnivora; Herbivores = members of the Orders Artiodactyla, Perissodactyla, Proboscidea, and Hyracoidea.