Female frogs are most often attracted to males who live in territories that provide the most food. The bullfrog has no natural predators, thanks in part to the toxic secretions its skin produces when touched, and animals that manage to capture the bullfrog often release them due to the unpleasant taste. Coupled with the strength of its long legs, the bullfrog very often never concerns himself with danger. The most important sense to a frog is hearing. Male bullfrogs often chorus at breeding ponds for several hours a night.
Female frogs give reciprocal, aggressive calls, as well.
Frogs use their incredible hearing to avoid capture, to listen for other frogs moving into their territory, and to protect their young. In many areas of the United States, bullfrogs help to keep populations of insects in check. Those states with unusually high volumes of mosquitoes will often ship in bullfrogs, which they add to waterways, rivers, streams, and lakes to help control overgrowth. The female bullfrog can lay as many as 25,000 small eggs in a day. After breeding in the spring, the adult female releases the eggs in the water to hatch into dark, greenish brown tadpoles.