Simplify the following text for a Grade 6 native English-speaking person.
Original: The species is found throughout Australia , where it is the most widespread native mammal , and in coastal and highland regions of southwestern New Guinea , where it is known as the Mungwe in the Daribi and Chimbu languages .
Simplified: In Australia , it is the most widespread native mammal . In New Zealand it is known as the Mungwe in the Daribi and Chimbu languages .