Northern leopard frog
| Northern leopard frog | |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Vertebrata |
| Class: | Amphibia |
| Order: | Anura |
| Family: | Ranidae |
| Genus: | Lithobates |
| Species: | L. pipiens |
| Binomial name | |
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Lithobates pipiens (Schreber, 1782) |
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The northern leopard frog (Lithobates pipiens or Rana pipiens) is a species of leopard frog from the true frog family, native to parts of Canada and United States. It is the state amphibian of Minnesota and Vermont.
The northern leopard frog is a fairly large species of frog, reaching about 11 cm (4.3 in) in snout to vent length (SVL). It varies from green to brown in dorsal colour, with large, dark, circular spots on its back, sides, and legs. Each spot is normally bordered by a lighter ring. A pair of dorsolateral folds starting from the back of the eye run parallel to each other down the back. These dorsolateral folds are often lighter or occasionally pinkish in colour. There is also a pale stripe running from the nostril, under the eye and tympanum, terminating at the shoulder. The ventral surface is white or pale green. The iris is golden and toes are webbed.
Tadpoles are dark brown or grey, with light blotches on the underside. The tail is pale tan.
The northern leopard frog has several different color variations, with the most common two being the green morph and the brown morph. There is another morph known as the burnsi morph. Individuals with the burnsi morph coloration lack spots on their back, but may or may not retain them on their legs. They can be bright green or brown and have yellow dorsal folds. Albinism also appears in this species, but it is very rare.
Northern leopard frogs have a wide range of habitats. They are found in permanent ponds, swamps, marshes, and slow-moving streams throughout forest, open, and urban areas. They normally inhabit water bodies with abundant aquatic vegetation. In the summer they often abandon ponds and move to grassy areas and lawns. They are well adapted to cold and can be found above 3,000 m (9,800 ft) asl. Males make a short snore-like call from water during spring and summer. The northern leopard frog breeds in the spring (March–June). Up to 6500 eggs are laid in water, and tadpoles complete development within the breeding pond. Tadpoles are light brown with black spots, and development takes 70–110 days, depending on conditions. Metamorph frogs are 2–3 cm (0.79–1.18 in) long and resemble the adult.
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