Pig Frog

Rana grylio
pig_frog_profile
Geographic Range
Southeastern US, ranging from eastern Texas to south central South Carolina, extending south into peninsular Florida.

Habitat
Generally, these frogs are distributed in most waterways, such as rivers, streams, lakes, ponds, swamps and marshes (Bartlett 1999). The pig frog inhabits the open centers of cypress ponds, which are an extension to, or separation from the prairies. They prefer ponds with the following vegetation types: water lilies, bladderworts, floating hearts, pickerel weed, saw grass, and maiden cane.

Physical Description

The pig frog ranges in length from 3.25 to 5.5 inches. Their appearance is that of a "bullfrog" with a rather narrow and pointed head and fully webbed hind feet. The fourth toe is webbed nearly to its tip. Pig frog coloration is olive to blackish brown with scattered dark spots. Its venter is white or pale yellow with a pattern that is the colors brown, dark gray and black woven into a net on the thighs. Their eyes are greatly elevated and unusually large, with only a narrow space between them. The middle and posterior back may have four longitudinal bands of bright orange-brown, alternating with bands of olive.
Male and female pig frogs are sexually different in size and coloration. Perhaps the most distinguishing characteristic is that males have a bright yellow throat Mature tadpoles are very colorful. They have a yellow belly with prominent reticulation on brownish black. Their sides have yellow spots that are encircled by a pinkish color.

Reproduction

Little appears to be known about the reproduction of pig frogs. Immense choruses of pig frogs erupt at night, when the vast majority of the mating occurs. Rainy, overcast or humid overcast weather seems to provide conditions that make for active mating. Breeding season is thought to begin in late May and continue through to August.
After mating, approximately 10,000 eggs are laid. The eggs are usually attached to pickerel weed stems in the middle of the pond or on the islands of a cypress pond. They can be found amongst saw grass and maiden cane. The eggs, which are small and bead-like, are laid in large masses on the surface of the water. The hatching period is 2-3 days. These eggs appear to have no animal predators; their only threat is the receding water.
Tadpoles are quite large (100mm), with extremely long tails. After transformation, the young frogs will remain in the same habitat as adults.

Behavior

As mentioned before little is known of the life of this frog. From what has been observed, they seem to be a shy species that is easily startled. They are rarely seen in the daylight, and are usually found hiding in aquatic vegetation. They are entirely aquatic, always surrounded by vegetation, and are rarely seen on land.
Although the pig frog is compared in many senses to the bullfrog, their voices are entirely different. This frog has a sound that is likened to the sound of the grunting of a herd of pigs.

Food Habits

The pig frog is mainly active at night and does most of its feeding at this time. Its primary diet consists of insects and crustaceans.

Information taken from University of Michigan, Museum of Zoology – Animal Diversity Web.

Facts About Pig Frog

Male pig frogs most distinguishing characteristic is a bright yellow throat.

After mating, a female will lay approximately 10,000 eggs.

This frog has a sound that is likened to the sound of the grunting of a herd of pigs.