Overview
- This week researchers formally named the southeastern gentoo, Pygoscelis kerguelensis, following findings first reported in a Communications Biology paper published in April 2026.
- The international team sequenced whole genomes from 64 birds across 10 breeding colonies and paired that genetic data with physical traits, vocal behaviour and habitat observations to delimit species.
- The study concludes that what was long called the single gentoo species actually comprises four distinct lineages now argued to be separate species: northern (P. papua), southern (P. ellsworthi), eastern (P. taeniata) and southeastern (P. kerguelensis).
- Researchers say localized foraging, strong site fidelity, geographic isolation and the Antarctic Polar Front drove divergence about 300,000–500,000 years ago, with the new species living on the remote Kerguelen and Heard Islands.
- The paper’s naming and species-level recommendations initiate a review by taxonomic authorities and could change regional biodiversity counts and conservation priorities for island gentoo populations.