American Bullfrog

Family Name
L. catesbeianus

American bullfrogs displace native frogs in habitats they invade by outcompeting and depleting the food sources of native frogs. Their colonization of lakes is followed by decline in the native red-legged frog and pacific chorus frog populations.

“Never move frogs – either as eggs, tadpoles, or adults—from one area to another!”


  • The American bullfrog (Lithobates catesbeianus or Rana catesbeiana) has a large robust body that can reach 20 centimeters in length.
  • Geen or brown in colour and have yellow or pale cream to white throats.
  • The baritone call of the bullfrog is so deep and resonant, it resembles the mooing of a cow.
  • Only males emit this trademark "jug-o-rum" bellow, and their choruses can be heard during the day or night during mating season.
  • Look for: the circular “ear drums” on the side of the head behind their eyes.
  • Weight up to 1.5 lb and 20 cm long. 

Habitat & Ecology

  • Among the most wide-ranging of all North American amphibians, they can be found in freshwater ponds, lakes, and marshes.
  • Average lifespan in the wild of 7 to 9 years

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