These frogs are native to eastern US. They were released into the western US and have taken off. They are now a problem for many endangered and natives species there. The female frog will lay up to 20,000 eggs which can take up to 2 years to become adult frogs. This large species has a voracious appetite much like the African bull frogs. They will eat anything that fits inside their mouths including other species of frogs, mice and fish. They are extremely fast predators, leaping from the water onto land and back into the water in a blink of an eye. They have been known to eat even small birds on occasion.
A Large Calling Bullfrog Video (below)