On which Australian island is the quokka especially associated with selfies?

The quokka is especially associated with selfies on Rottnest Island, Western Australia.

Rottnest Island supports a well-known quokka population, and close-up photographs of the animals helped make the island an international tourist destination. Quokkas are small macropods, related to kangaroos and wallabies, with rounded faces and compact bodies. Their natural facial expression is sometimes mistaken for a smile.

The island’s Aboriginal name, Wadjemup, is increasingly used alongside Rottnest. Dutch explorer Willem de Vlamingh named the island Rottenest in 1696 after mistaking quokkas for large rats. The Dutch name eventually became Rottnest in English.

Quokkas also live on parts of mainland Western Australia and on other offshore islands. They are herbivores that feed mainly at night and can survive periods without drinking by obtaining moisture from vegetation. Visitors should not feed or handle them: human food can cause illness, and wildlife authorities regulate interactions to protect the animals.