Link to English Wikipedia entry: Sumatran Orangutan
Link to German Wikipedia: Sumatra-Orang-Utan
Link to French Wikipedia: Orang-outan de Sumatra
Link to EOL.org: Pongo abelii
Link to iNaturalist.org: Pongo abelii
Links to my pictures: Sumatran Orangutan
Binomial Links for Pongo abelii on www.geichhorn.com
Dr. Günther Eichhorn Travel Website
Soaring website