This Week in PNAS . In This Issue . PNAS September 28, 2021 118 (39) eiti3921118; https://doi.org/10.1073/iti3921118 Article . Figures & SI . Info & Metrics . PDF . POPULATION BIOLOGY . Download figure . Open in new tab . Download powerpoint . A captive pseudomelanistic tiger and its normal sibling at Nandankanan Biological Park, Bhubaneswar, India. ...