Green Frog (Lithobates clamitans)
Order Anura, Family Ranidae, Genus Lithobates, Species Lithobates clamitans
Species
Green Frog (Lithobates clamitans)
Family
Order Anura, Family Ranidae, Genus Lithobates, Species Lithobates clamitans
Size
Adult snout-to-vent length (SVL) typically ranges from 5.7 to 10 cm (2.2 to 3.9 inches). Females are occasionally slightly larger than males. Weight ranges from 28 to 85 grams.
Conservation
IUCN Red List status is Least Concern, with a stable overall population trend, though localized populations face threats from habitat loss and pollution.
Description
A striking and vocal resident of North American wetlands, the Green Frog is instantly recognizable by its vibrant green snout and prominent dorsolateral folds. Often sitting patiently at the water's edge, it provides an iconic soundtrack to summer evenings with its signature banjo-like plucking call.
Key Features
Bright green head and anterior back, prominent dorsolateral folds stopping halfway down the body, large tympanum, and strong preference for permanent freshwater margins.
Physical Description
Robust, stout-bodied frog with a broad head, prominent golden eyes with horizontal pupils, and a large, distinct tympanum directly behind the eye. Long, powerful hind limbs adapted for leaping. Unlike some relatives, it lacks extensive toe pads and exhibits extensive webbing on the hind feet.
Skin Texture & Coloration
Skin is generally smooth with some granular tubercles on the back. Coloration ranges from bright green to brownish-olive on the head and anterior body, often fading to brown posteriorly. Dark spots or mottling are scattered across the dorsum, and the lips often feature pale green or yellowish highlights.
Distinguishing Features
The most prominent diagnostic feature is a pair of dorsolateral folds that run from behind the eye down the back, but stop short of the groin (unlike the southern leopard frog where they continue all the way). The large tympanum is significantly larger in males than in females.
Habitat
Found primarily in freshwater habitats including the edges of permanent ponds, lakes, swamps, streams, and marshes. Prefers areas with abundant emergent aquatic vegetation, hiding along muddy banks.
Geographic Range
Native to eastern North America, spanning from southeastern Canada down through the eastern United States to the Gulf of Mexico and Texas.
Behavior
Primarily nocturnal and crepuscular, though often active by day during warm, rainy weather. Sits quietly near water edges and leaps into the water when disturbed, producing a sharp squeak.
Diet & Feeding
Carnivorous ambush predator consuming almost any animal it can swallow, including insects, spiders, worms, small fish, snails, and occasionally other small frogs.
Reproduction
Breeds from late spring through late summer. Males establish territories and emit banjo-like calls to attract females. Females lay clusters of up to 4,000 eggs attached to submerged vegetation.
Vocalizations
The advertisement call resembles the sound of a loose banjo string being plucked (a sudden, sharp 'guck' or 'twang'), usually given as a single note or a series of short notes.
Life Cycle
Eggs hatch in less than a week into tadpoles, which overwinter as larvae for one to two years before undergoing metamorphosis into juvenile frogs. Adult lifespan in the wild is typically 6 to 10 years.
Conservation Status
IUCN Red List status is Least Concern, with a stable overall population trend, though localized populations face threats from habitat loss and pollution.
Toxicity & Defense
Non-toxic to humans; relies primarily on rapid leaping into deep water to escape predators, sometimes emitting a startled distress squeak upon capture.
Ecological Role
Acts as both predator of pest insects and prey item for wading birds, snakes, raccoons, and larger fish, serving as an important link in aquatic food webs.
Similar Species
Often confused with the Bullfrog (Lithobates catesbeianus), which lacks dorsolateral folds entirely, and the Mink Frog (Lithobates septentrionalis), which has shorter range and a musky odor.
Observation Tips
Best observed at night with a flashlight along the muddy banks of quiet ponds or slow-moving streams during warm summer months.
Handling & Safety
Handle only with clean, wet hands or gloved hands to avoid transferring harmful oils, lotions, or chemicals to the frog's sensitive, permeable skin.
Seasonal Activity
Active from spring through autumn. Overwinters by burrowing into the mud at the bottom of ponds or streams, entering brumation until spring warming triggers emergence.
Cultural Significance
Frequently encountered by gardeners and anglers, the green frog serves as a familiar symbol of healthy wetland ecosystems throughout eastern North America.
Interesting Facts
Green frog tadpoles can overwinter twice before transforming, sometimes growing larger than the resulting adult frogs during their extended larval stage.