https://www.usgs.gov/publications/mercury-speciation-and-stable-isotopes-emperor-penguins-first-evidence-biochemical
Apex marine predators, such as toothed whales and large petrels and albatrosses, ingest mercury (Hg) primarily in the form of methylmercury (MeHg) via prey...
stable isotopesemperor penguinsmercuryspeciationfirst