American Bullfrog

Lithobates catesbeiana

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• 9–15 cm, record 20 cm 
• Dorsolateral ridge not present 
• Green, olive or brown 
• Fold of skin extends from eye around the tympanum to shoulder 
• Ontario’s largest frog 
• Male has bright yellow throat and tympanum twice the size of the eye (similar to green frog males, but bullfrogs are generally much larger) 
• Young bullfrogs have small black spots on their green backs 
• Found near shorelines of lakes, bays, large beaver ponds, and the mouths of slow-moving rivers; usually near deep, permanent waterbodies (necessary for tadpoles that overwinter in the water) 
• Males are very territorial and will defend breeding territory by jumping at an invading male and trying to flip him over