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Fig. 4. Scaling of gestation periods for the same sample of 429 placental mammal
species, following subdivision into species with altricial neonates and those
with precocial neonates. Best-fit lines fitted separately to the two grades
have approximately similar slopes that are both markedly lower than the
overall slope for the single distribution shown in
Fig. 3 and are generally close
to 0.15. (For altricial mammals: least-squares regression, 0.158; major axis,
0.160; reduced major axis, 0.198; rotation line, 0.176. For precocial mammals:
least-squares regression, 0.135; major axis, 0.136; reduced major axis, 0.168;
rotation line, 0.133.) (After Martin,
1989.) Gestation (days); body mass (g).
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