Fig. 5. Field metabolic rate (FMR) in relation to body size for marine mammals. Points represent male and females of each species where available. Marine mammals include sea otters from the present study (triangles), and phocid seals (squares), otarids (diamonds), and odonticetes (circles) from Williams et al. (Williams et al., 2004a). The thin line through the points is the least squares allometric relationship and is described by FMR=1367.7mass^0.76 (N=24, r²=0.949, P<0.001) from Williams et al. (Williams et al., 2004a).