There are bull frogs in the shallows of our lake. Cat tails, wild iris and scrub willow provide habitat and hiding places. Bull frogs can weigh 1 pound. They eat anything they can swallow including other frogs, birds, bats and fish. This is breeding season. The girls are standing by, ready to pick the best guy. And so, the males call. Bull frogs are called bull frogs because their call sounds like the roar of a bull. In the flush of competition, males demonstrate their bona fides. The calling goes on at night.
I had intended to simply provide a link to a calling bull frog so you could hear for yourself. Here is that link.
But I found a short video that is well worth watching. It is a cliff hanger. Don't skip to the end. Watch the whole thing.