Rana catesbeiana

Range: Native to North America, in states east of the Rocky mountains; also native to Canada and Mexico (Not a native of Colorado.) Have been introduced to many other localities in the world.

Habitat: Lake, pond, river, bog: warm, still, shallow waters are preferred.

Conservation Status: Least concern. In Europe and western U.S., measures are often taken to control its spread because it competes with, and often drives out, native species.

American Bullfrog

  • • Largest frog in North America -- can reach 6 inches long and weigh up to 1.6 lbs.
    • Females typically larger than males. During the breeding season, the throat of the males is yellow, the female’s is white.
    • Hind feet are fully webbed.
    • Hunting style is “sit and wait.” Can wait for a long time, then with a quick flick of the tongue, they pull it into their mouths. (It looks more like they lunge at the food.)
    • Nocturnal and diurnal. Most active when weather is moist and warm.
    • Adult males are very aggressive; defend territories (3-25 meters of shoreline) by physically wrestling with others.
    • Good sense of vision and sense vibrations.
    • Invasive in Colorado; is wiping out the native Leopard frogs.
    • In winter, may bury itself in the mud, and build a small cave-like structure.
    • Females lay up to 20,000 eggs in a foamy film in quiet, protected waters. Tadpoles emerge from fertilized eggs in 4 days.
    • Metamorphosis takes 12-24 months. Adults reach sexual maturity at 3-5 years.
    • Lifespan in the wild approx. 8 years, in captivity up to 16 years.
    • Food: insects, fish, snakes, small birds, and other frogs.

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