Northern Green Frog (Lithobates clamitans melanota)
Order Anura, Family Ranidae (True Frogs), Genus Lithobates, Species L. clamitans. As a member of Ranidae, they possess powerful legs and smooth, dorsally ridged skin.
Species
Northern Green Frog (Lithobates clamitans melanota)
Family
Order Anura, Family Ranidae (True Frogs), Genus Lithobates, Species L. clamitans. As a member of Ranidae, they possess powerful legs and smooth, dorsally ridged skin.
Size
SVL typically 5.7 to 10 cm (2.25-4 inches). Females are generally larger than males. Weights range from 28 to 85 grams.
Conservation
IUCN Least Concern. Populations are stable and widespread, though vulnerable to local wetland drainage and chemical runoff.
Description
The quintessential pond frog of North America. Often mistaken for Bullfrogs, these bronze-backed beauties are the soundtrack of summer nights with their banjo-like calls.
Key Features
Dorsolateral ridges terminating before the groin, large tympanum, bright green upper lip, and a 'banjo-string' advertisement call.
Physical Description
Robust body with a large, visible tympanum (eardrum) and prominent dorsolateral ridges. The iris is copper-bronze, and the limbs are long and muscular with webbed hind feet.
Skin Texture & Coloration
Skin is mostly smooth with subtle granularity. Color is olive-brown to bronze-green; often bright green around the upper jaw and snout. Ventral side is white with gray mottling on the throat of males.
Distinguishing Features
Prominent dorsolateral ridges that extend down the back but do not reach the groin (unlike leopard frogs). The tympanum is larger than the eye in males and roughly equal to the eye in females.
Habitat
Highly aquatic; found in permanent freshwater like ponds, lakes, marshes, and slow-moving streams. Prefers edges with ample vegetation and basking spots.
Geographic Range
Native to Eastern North America, from the Canadian Maritimes to North Carolina, and west to Minnesota and Oklahoma. Introduced populations exist in British Columbia and Hawaii.
Behavior
Primarily nocturnal but often seen basking during the day. Dipping into water at the first sign of danger with a high-pitched 'clink' or splash.
Diet & Feeding
Generalist carnivore eating beetles, flies, spiders, worms, and occasionally smaller frogs or fish. Uses a sit-and-wait ambush strategy.
Reproduction
Prolonged breeders (May - August). Males defend underwater territories. Amplexus is axillary. Eggs are laid in a floating jelly mass attached to vegetation.
Vocalizations
An advertisement call sounding like a single, sharp 'twang' of a loose banjo string. May repeat the call 3-4 times in succession.
Life Cycle
Eggs hatch in 3-7 days. Tadpoles can take over a year to metamorphose in northern climates. Lifespan is approximately 6-10 years in the wild.
Conservation Status
IUCN Least Concern. Populations are stable and widespread, though vulnerable to local wetland drainage and chemical runoff.
Toxicity & Defense
Non-toxic to humans. Defense includes camouflage, powerfulпрыжок (jumping) into water, and producing a slippery mucus to escape predators.
Ecological Role
Important mid-level consumer that controls insect populations and serves as a primary food source for herons, snakes, and larger fish.
Similar Species
American Bullfrog (Lithobates catesbeianus) - lacks dorsolateral ridges; Northern Leopard Frog (Lithobates pipiens) - ridges reach all the way to the groin.
Observation Tips
Walk slowly along pond edges on warm summer evenings with a flashlight to see their eye-shine; listen for the distinct 'gunk' sound.
Handling & Safety
Generally safe, but always use wet hands to protect their semi-permeable skin from oils and salts. Wash hands after to avoid salmonella risk.
Seasonal Activity
Active from late spring through early autumn. Hibernates underwater in the mud at the bottom of ponds or in oxygenated stream crevices during winter.
Cultural Significance
Commonly featured in children's literature as the 'classic' frog; used as a bio-indicator for water quality in the Great Lakes region.
Interesting Facts
Male Green Frogs have a bright yellow throat during the breeding season and their eardrums can be twice the size of their eyes.