Rain-filled desert claypan in the arid interior of New South Wales, Australia. Much of arid outback Australia can be considered ephemeral wetland, flooded infrequently by thunderstorms or monsoonal rains draining from the north, with its own wetland fauna. If no more rain falls on this claypan, the summer sun and dry winds will evaporate the water within weeks, but crustaceans and frogs will have bred, and nomadic waterbirds will move on.