Gross morphology during metamorphosis determined by wet weight and length was similar for treated (rAdglob) and control groups (no injection, or Freund's adjuvant only) (Fig. 3a) . Treatment with adult haemoglobin did not significantly delay metamorphosis. There was no significant difference in tadpole fitness between treatment and control groups just before metamorphic climax measured by swimming performance (burst swim speed). A p-value of 0.086 was determined in Microsoft Excel using the student t-test, 2-tailed distribution, 2-samples of unequal variance. Likewise there was no significant difference between treatments in the fitness of metamorphs as measured by maximum jump length (Fig. 3b) . A p-value of 0.996 was determined using the same student t-test as for the swim speed.