Fig. 8. Regression lines for the lung area against total body volume in normal X. laevis tadpoles, giant tadpoles with solid lungs and giant tadpoles with inflated lungs. Giants with inflated lungs had the largest relative lung area, followed by normal tadpoles, and lastly by giants with solidified lungs. However, the increase in lung area relative to the body volume was the fastest in giant tadpoles with solidified lungs. All regressions are significant (P<0.001).