The main reason for calling is to allow male frogs to attract a mate.

"How can you tell a male frog from a female frog?"

In most cases, male frogs follow up on their mating calls by courting the females they attract.

The male frogs breeding call sounds like the bleating of sheep.

The male frogs use their fangs to attack other males in combat.

Initially, male frogs will produce advertisement calls which convey information about species, sexual readiness, and size.

Eavesdropping also allows male frogs to assess the body size of their competitors.

A 2010 study found that atrazine rendered 75 percent of male frogs sterile and turned one in 10 into females.

He said the male frog calls to the female in "three sound bites."

The male frog's advertisement call is a series of a few small grunts, usually given while swimming around underwater.