Researchers have been using stable hydrogen (H) and carbon (C) isotopes in bird feathers to track migration patterns, but stable sulfur (S) isotopes are less understood.
This study analyzed feather S values from 13 bird species in India, including marine, resident, and a single migratory bird, the Bar-headed Goose.
Marine birds had significantly higher S values compared to terrestrial resident species, with patterns differing notably in the Himalayan region and Gangetic plain, highlighting the potential of S isotopes in studying bird migration.