Rana sylvatica

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Wood Frog

Taxonomy:

  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Amphibia
  • Order: Anura
  • Family: Ranidae
  • Genus: Rana
  • Species: Rana sylvatica

Common Names by Region:

  • North America: Wood Frog
  • Canada: Grenouille des bois

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Description:

Size: Adults typically range from 3.5 to 7.6 cm (1.4 to 3 inches) in length.

Coloration: Usually brown, tan, or rust-colored with a distinctive dark mask extending from the nose through the eye to the tympanum.

Skin Texture: Smooth and moist.

Distinguishing Features: Dorsolateral folds (raised lines running along the sides of the back) are prominent; males are smaller than females and have swollen thumbs during the breeding season.


Known Range:

Geographical Distribution: Widely distributed across North America, from the northern forests of Canada and Alaska down to the northern United States.

Habitat: Prefers moist woodlands, swamps, bogs, and the margins of ponds and streams. Can also be found in tundra and taiga regions.


Diet:

  • Adults: Primarily carnivorous, feeding on a variety of invertebrates such as insects, spiders, and worms.
  • Larvae (Tadpoles): Herbivorous, feeding on algae and plant material, but also consume detritus and small aquatic organisms.

Breeding:

Breeding Season: Early spring, often shortly after ice melts in ponds and vernal pools.

Reproduction: Males call to attract females using a quack-like call. Females lay large masses of eggs in water, which males fertilize externally.

Eggs: Laid in clusters attached to submerged vegetation; hatch in about two weeks, depending on temperature.


Lifecycle:

Egg Stage: Eggs hatch into tadpoles within a few weeks.

Larval Stage (Tadpoles): Tadpoles undergo metamorphosis over several weeks to months, depending on environmental conditions.

Juvenile Stage: Metamorphosed juveniles (froglets) leave the water and start a terrestrial life.

Adult Stage: Mature within one to two years; live up to 3-5 years in the wild.

Hibernation: Unique among amphibians for their ability to survive freezing temperatures during winter by entering a state of suspended animation, with up to 70% of their body water freezing.

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