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Fig. 1. Relationship between body mass (M) and (A) maximum burst swimming velocity (Umax) (logUmax=1.78+0.20logM, N=55; r=0.30; P<0.05) and (B) the time taken to reach exhaustion whilst swimming at a constant velocity (endurance, Emax) (logEmax=2.57+1.4logM, N=55; r=0.46; P<0.01) for 55 juvenile Xenopus laevis.