Fig. 1.

Absorption spectra for oxyhemoglobin (O₂Hb), deoxyhemoglobin (HHb) and carboxyhemoglobin (COHb) in northern elephant seals. Peaks for O₂Hb (542 and 577 nm), HHb (555 nm) and COHb (539 and 569 nm) match those of other mammalian species (human, cow, sheep) (from Zijlstra et al., 2000).