Up to 500 wallabies are marooned on an island in the middle of Lake Argyle in the east Kimberley region of Western Australia.
The ABC reports they have been stranded there since late last week while seeking refuge from record rains and flooding.
The Department of Environment and Conservation says a close eye is being kept on the animals.
A veterinarian will be sent to the island by helicopter on Monday to assess the situation.
The department says the island may not be a safe haven for much longer as the flood waters are expected to rise over the coming weeks.
Currently the island measures about 300 x 100 metres. It is approximately 10km from the lake shore.
DEC says the island is part of a rocky promontory during the dry season when there is little food to sustain any animals.