Rocky Mountain Amphibian Project

A WYOMING BIODIVERSITY CITIZEN SCIENCE INITIATIVE PROJECT


American Bullfrog (Lithobates catesbeianus)

The American Bullfrog

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  • Largest frog in Wyoming (may be introduced)
  • Size: ~2 inches (metamorph) to ~6 inches (adult)
  • Dorsal color: light green to dark olive or brown
  • Dark spots or dark mottling
  • Ventral color: cream to yellow with dark mottling
  • Dorsolateral folds end behind the tympanum (not continued down back)
  • Mp3 of call (courtesy of Gary Nafis, californiaherps.com; contact Gary for permission to use on other websites)

Photo to right: dannymartinphotography.com

Eggs & Tadpoles

  • Eggs in large floating sheet on surface (1 to 5 feet wide with up to 20,000 eggs)
  • Tadpoles olive green above with gold metallic flecks and lots of small dark spots on body, tail muscle and tail fin; cream to yellow bellies
  • Tadpoles can reach up to 5.5 inches
  • Tadpoles eyes are medial, anal vent is on the side

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Photos above: Wyoming Game and Fish Department

Breeding Habitat

Shallow portions of permanent water bodies with lots of vegetation; prefer warm water.

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Photo by Wyoming Natural Diversity Database

Native Range

Bullfrog.jpgMap by Wyoming Natural Diversity Database