Close up to face of dominant male, Bornean orangutan (Pongo pygmaeus) with the signature developed cheek pads that arise in response to a testosterone

- Image ID: PH16PK
Close up to face of dominant male, Bornean orangutan (Pongo pygmaeus) with the signature developed cheek pads that arise in response to a testosterone
Witthaya Khampanant / Alamy Stock Photo
Image ID: PH16PK
Close up to face of dominant male, Bornean orangutan (Pongo pygmaeus) with the signature developed cheek pads that arise in response to a testosterone surge.