The pig frog (Lithobates 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 This is because of the size of the frog. Pig Frogs can be between 3.35 to 6.5 inches. Taxonomy Pig frogs (Lithobates grylio) are a species of frog that belong to the class Amphibia, the order Anura, the family Ranidae, and the genus Lithobates. They are part of the phylum Chordata, which includes animals with a notochord and a hollow nerve cord. Pig frogs are vertebrates, meaning they have a backbone, and they are tetrapods, meaning they have four limbs. They are adapted to living both on land and in water, and they are commonly found in the southeastern United States. Norwegian-American naturalist Leonhard Stejneger described the pig frog in 1901, and it still bears its original name. The name comes from the calls the frog makes, sounding like a pig grunting. Description 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 large tympana (eardrums). The Pig frog is sexually dimorphic in size and coloration, the males also have a larger tympanum than the females. It is easily mistaken for various other species of the genus Lithobates, with which it shares its geographic range, including the American bullfrog (Lithobates catesbeiana). Pig frogs grow to a snout to vent length (SVL) of . They are known for their loud, deep snorting sound, reminiscent to the oinking sound of a pig. 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. Diet Pig frogs are opportunistic feeders and will eat a wide variety of prey, including insects, worms, and small vertebrates. Their primary diet is crawfish, but like most bullfrogs, they will consume almost anything they can swallow, including insects, fish, and other frogs. They are known to feed on beetles, dragonflies, crayfish, and other aquatic invertebrates, and may also occasionally eat fishes and amphibians. They are nocturnal animals and are usually found near water, where they use their strong legs to leap and catch prey. Pig frogs are