WANTED INVASIVE AMERICAN BULLFROG tympanum If you have seen or heard bullfrogs in Ninepipe Reservoir, or elsewhere in the Mission Valley, please report sightings. Your information is important to us! Identifying Characteristics Bullfrogs are 4-6 inches in body length as adults, much larger than any native amphibian. Their tympanum (eardrum) is as large or larger than their eye. Report Sightings & Learn Calls: Threat to Native Species Scan QR Code with Smartphone Camera Bullfrogs will eat anything that fits in their large mouths; including birds, snakes, turtles, fish, and other amphibian species. Their voracious appetite has contributed to population declines of several native amphibian species. by C Northern Leopard Frog Columbia Spotted Frog Sierran Treefrog Western Toad CSKT Wildlife Management Program, Montana FWP, and Montana Conservation Corps 180003 WANTED INVASIVE AMERICAN BULLFROG tympanum If you have seen or heard bullfrogs in Ninepipe Reservoir , or elsewhere in the Mission Valley , please report sightings . Your information is important to us ! Identifying Characteristics Bullfrogs are 4-6 inches in body length as adults , much larger than any native amphibian . Their tympanum ( eardrum ) is as large or larger than their eye . Report Sightings & Learn Calls : Threat to Native Species Scan QR Code with Smartphone Camera Bullfrogs will eat anything that fits in their large mouths ; including birds , snakes , turtles , fish , and other amphibian species . Their voracious appetite has contributed to population declines of several native amphibian species . by C Northern Leopard Frog Columbia Spotted Frog Sierran Treefrog Western Toad CSKT Wildlife Management Program , Montana FWP , and Montana Conservation Corps 180003