Simplify the following text for a Grade 14 native English-speaking person.
Original: Red-necked Wallabies are found in coastal scrub and sclerophyll forest throughout coastal and highland eastern Australia , from Rockhampton , Queensland to the South Australian border ; in Tasmania and on many of the Bass Strait islands ( although it is unclear which of the islands have native populations as opposed to introduced ones ) ; in New Zealand 's South Island in certain areas of Otago Region .
Simplified: Red-necked Wallabies are found along the coast and forests of eastern Australia , from Rockhampton , Queensland to the South Australian border ; in Tasmania and on many of the Bass Strait islands ( many of these may have been introduced to the islands ) .