Bull Frog Sound Effects - The Best High Quality Sounds and Ringtones by APH International
Canadian Herpetological Society
Hi-Line Gift Ltd. American Bullfrog
Canadian Herpetological Society
Meet (and Hear) the Frogs of Canada - Nature Canada
The Green Frog
All About the American Bullfrog - Grit
American bullfrogs wreaking havoc in Fraser Valley watersheds - The Abbotsford News
How can a green frog be blue?
American Bullfrog (Lithobates catesbeianus) - Species Profile
Toronto Zoo Adopt A Pond - Species Guides
Bullfrog, Large, Green, Nocturnal
Green bull frog hi-res stock photography and images - Alamy