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Amero-Australian Treefrogs: Hylidae - Paradox Frog (pseudis Paradoxa): Species Accounts

frogs water york toads

Physical characteristics: The paradox frog, also known as the paradoxical frog, has large, bulging eyes on the top of its head and a rounded and somewhat pointed snout. It has long and powerful hind legs and shorter but still strong front legs. Its toes are webbed. Its back is light brown to greenish brown, sometimes with light-colored stripes, and its underside is white. Females grow to 1.7 to 3.2 inches (4.0 to 6.5 centimeters) from snout to rump, while males reach 1.6 to 2.7 inches (3.8 to 6.5 centimeters) in length.

This frog remains in the water most of the time, often with just its eyes poking above the surface. (R. Andrew Odum/Peter Arnold, Inc.)

Geographic range: Populations of this frog are scattered through parts of northern and central South America, from Uruguay and southern Brazil in the south to Venezuela in the north.


Habitat: It lives in grassy or open forest areas near marshes, ponds, or slow-moving creeks.


Diet: It eats water-living arthropods, as well as small frogs.


Behavior and reproduction: This frog remains in the water most of the time, often with just its eyes poking above the surface. It is mainly active at night except during its breeding season, when the males may make their loud, croaking calls at any time of night or day. Females come to the males and mate with them, laying their eggs among the plants that grow in the water. The eggs, which are grouped together in foamy clusters, hatch into tadpoles. Tadpoles continue to grow in the water and can reach lengths of 11 inches (27 centimeters) before changing into froglets. Much of the length of the tadpole is in its tail, and once that shrinks away, the froglet is much smaller.


Paradox frogs and people: Some local people eat the large tadpoles of this species.


Conservation status: The paradox frog is not considered threatened or endangered. ∎

FOR MORE INFORMATION

Books:

Badger, David. Frogs. Stillwater, MN: Voyageur Press, 2000.

Barker, John, Gordon Grigg, and Michael J. Tyler. A Field Guide to Australian Frogs. Chipping Norton, Australia: Surrey Beatty and Sons, 1995.

Duellman, William E. Hylid Frogs of Middle America. Ithaca, NY: Society for the Study of Amphibians and Reptiles, 2001.

Halliday, Tim, and Kraig Adler, eds. The Encyclopedia of Reptiles and Amphibians (Smithsonian Handbooks). New York: Facts on File, 1991.

Mattison, Chris. Frogs and Toads of the World. New York: Facts on File Publications, 1987.

Meyer, John R., and Carol F. Foster. A Guide to the Frogs and Toads of Belize. Malabar, FL: Krieger Publishing Co., 1996.

Miller, Sara Swan. Frogs and Toads: The Leggy Leapers. New York: Franklin Watts, 2000.

Patent, Dorothy Hinshaw. Frogs, Toads, Salamanders, and How They Reproduce. New York: Holiday House, 1975.

Showler, Dave. Frogs and Toads: A Golden Guide. New York: St. Martin's Press, 2004.

Tyning, Thomas. A Guide to Amphibians and Reptiles. Boston, MA: Little, Brown and Company, 1990.


Periodicals:

Milius, Susan. "Wafting Pesticides Taint Far-flung Frogs." Science News (December 16, 2000): 391.

Milius, Susan. "Wasps Drive Frog Eggs to (Escape) Hatch." Science News (October 14, 2000): 246.

Turner, Pamela S. "The Extreme Team." Odyssey (May 2002): 26.


Web sites:

"Sticky Fingers." American Museum of Natural History. http://www.amnh.org/exhibitions/frogs/featured/sticky.php (accessed on April 10, 2005).

"Wax On, Wax Off." American Museum of Natural History. http://www.amnh.org/exhibitions/frogs/featured/waxon.php (accessed on April 10, 2005).

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over 7 years ago

called the Paradoxical Frog because the tadpole is larger than the full grown frog. go figure