Orang-utan (Pongo Borneo) female orang-utan covering head with branch in monsoon, Sepilok Orang Utan Sanctuary, Sabah, Malaysia [Getty Images]

Orang-utan (Pongo Borneo) female orang-utan covering head with branch in monsoon, Sepilok Orang Utan Sanctuary, Sabah, Malaysia

Oxford Scientific Louise Heusinkveld