the american bullfrog (lithobates catesbeianus)

generated american bullfrog lithobates catesbeianus simply canada bullfrog amphibian amphibians amphibious animal aquatic big biology brown bull bull frog frogs camouflage close close-up closeup common conservation dimorphic environment eyes family ranidae green habitat head invasive species catesbeianus marsh native nature north america american northeast outdoors poisoning poisoning pollywog pond predator swimming tadpoles toad water wetland wild wildlife