Length-mass relationship for narwhals from West and East Greenland with regression line for both sexes combined. The whales from West Greenland are from
 and those from East Greenland are from this study. The power functions that predict the mass of narwhals (East and West Greenland combined) instrumented with stomach temperature sensors were: Female: Body mass = 0.003 × Length2.08, r2 = 0.88. Male: Body mass = 0.002 × Length2.17, r2 = 0.80.