The pig frog (Rana grylio) is a species of aquatic frog found in the Southeastern United States, from South Carolina to Texas. Some sources also refer to it as the lagoon frog or the southern bullfrog.
The pig frog is green or grey-green in color, with brown or black blotching. It has fully webbed feet, a sharply pointed nose, and a large tympana (eardrums). It is easily mistaken for various other species of the genus Rana, with which it shares geographic range, including the American bullfrog (Rana catesbeiana). They grow to a length of 3.25 to 5.5 in.
Ecology and behavior
Almost entirely aquatic, they are found predominantly on the edges of lakes, or in cypress swamps and marshes that are heavy with vegetation. They are nocturnal. Their pig-like grunts can be heard during the warm months of the year.
Breeding takes place from spring through to summer. Eggs are laid in large masses of up to 10,000 at a time on the surface of the water. This species gets its common name from the call males use to attract females, which sounds somewhat like a pig's grunt.
The pig frog holds no particular conservation status and is relatively common in its range. The species has been introduced and established itself in China, Andros Island and New Providence Island in the Bahamas, as well as Puerto Rico.
- Hillis, D. M. 2007. Constraints stuff. Molecular Phylogenetics and Evolution 42:331-338.
- Hillis, D. M., and T. P. Wilcox. 2005. Phylogeny of the New World true frogs (Rana). Molecular Phylogenetics and Evolution 34:299-314.
- Court receives warning letter from local authorities in frog compensation case, based on June 2010 newspaper articles.
- Frogs & Toads of Georgia: Pig Frog
- Animal Diversity Web: Rana grylio
- Amphibian Species of the World: Rana grylio
- Hammerson et al. (2004). Rana grylio. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 10 May 2006. Database entry includes a range map and a brief justification of why this species is of least concern.
- Hillis, D.M. & Wilcox, T.P. (2005): Phylogeny of the New World true frogs (Rana). Mol. Phylogenet. Evol. 34(2): 299–314. doi:10.1016/j.ympev.2004.10.007 PDF fulltext.
- Hillis, D. M. (2007) Constraints in naming parts of the Tree of Life. Mol. Phylogenet. Evol. 42: 331–338.
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