By Megan Kierzek
Geographic Range
Cyclorana platycephala occupies the southern arid regions of Australia.
Biogeographic Regions:
australian 
(native ).
Habitat
The water-holding frog prefers to live in grasslands, temporary swamps, claypans, and billibongs. Their distribution is limited to southern Australia (S. Australian Frogcensus 1999).
Terrestrial Biomes:
savanna or grassland .
Aquatic Biomes:
rivers and streams.
Physical Description
The water-holding frog is characterized by a broad, flat head, completely webbed toes, and a stout body which is usually dull gray to dark brown or green. They also have small eyes that are placed somewhat laterally and forward-directed, enhancing vision downward and binocular perspective (Cogger and Zweifel 1998). The water-holding frog can also be characterized by its distinct call of a long drawn out "mawww, mawww". The male frogs range in size from 42-64mm, where the females range from 50-72mm (S. Australian Frogcensus 1999).
Reproduction
The water-holding frog only emerges from deep underground after it rains to breed. It lays large amounts of spawn in still water after floods. Some eggs may be attached to vegetation, or spread in a thin film on the surface, thus ensuring adequate oxygen in warm waters suffering from oxygen depletion (Cogger and Zweifel 1998). Tadpoles of the water-holding frog can reach a maximum length of 60mm (S. Australian Frogcensus 1999).
Behavior
Cyclorana platycephala has the ability to undergo an amazing process called aestivation. During hot, dry conditions, the water-holding frog buries itself in the sandy ground and becomes inactive, maintaining a reduced metabolic rate. During aestivation, the water-holding frog secretes mucous from the skin, which lines the chamber and hardens around the frog's body, allowing the frog to hold large amounts of water. This impervious outer skin "cocoon" also prevents desiccation and is torn open by the frog when it emerges from deep underground after it rains (Cogger and Zweifel 1998). Aestivation in many aspects is similar to hibernation, differing only in that hibernation is a response to cold conditions (Withers 1993).
Food Habits
Cyclorana platycephala prefers to eat a diet consisting mainly of insects and small fish. The water-holding frog has the rare ability to catch their prey underwater. They do this by using their strong, muscular attributes and lunging at their prey, stuffing it in their mouths.
Economic Importance for Humans: Positive
Because of their unique and unusual ability to retain large amounts of water, the water-holding frog has become the best example of a burrowing frog traditionally used by the Aboriginies. As the water is stored in the bladder or in the pockets of skin, a slight pressure applied by hand causes the frog to release water. The Aboriginal people dig up Cyclorana platycephala and enjoy the resource this frog has to offer. This water is very fresh and after the Aboriginies drink, the frog is released unharmed (S. Australian Frogcensus 1999).
Conservation Status
We have no text on this topic for this species. Look to the sidebar on the right for some limited information.
Contributors
Megan Kierzek (author), Michigan State University.
James Harding 
(editor), Michigan State University.
