Syrrhophus Cystignathoides Campi - The University of Texas - contains a few pictures, some information, and an out-of-date map of the chirping frog's territorial range.
Syrrhophus marnocki - The University of Michigan - contains a picture and classification with links to the Phylum, Class, Order, and Family of this frog.
Chirping Frogs - contains information on and pictures of Cliff Chirping Frogs (Syrrhophus marnocki) and Spotted Chirping Frogs (Syrrhophus guttilatus).
Herpetology: Amphibian Diversity - University of Texas - contains pictures and some information on the frogs of the order Anura and a frog phylogeny chart (in Adobe Acrobat format).
Amphibians of Texas - Texas Tech University - contains information on the Common Name, Scientific Name, Order, Family, Global Rank, Federal Status, Author, and Elcode of Texas Amphibians.
Amphibians in Texas - Texas Parks and Wildlife - contains information on amphibians of Texas and what you can do to help.
Texas Robber Frogs - Texas Parks and Wildlife - contains information on Cystignathoides campi and links to the different classification levels.
The Yardlist of Wildlife Seen - Houston, Texas - a family has logged all the species they have seen in their backyard since 1990, including Herps (and Rio Grande Chirping Frogs).
Herpetofauna of the Upper Texas Coast -- A checklist of amphibians and reptiles that can be found in the Texas coastal counties of Brazoria, Chambers, Fort Bend, Galveston, Harris, and Jefferson, compiled by Mark Scheuermann, 1995.
