Nature Cat leads his friends to the pond for a day of listening to one of the most amazing spring sounds: the bullfrog croak! At the pond, amid the bullfrog croaks, the gang hears another sound: ...

Even in the fall, there are a few Quak concerts. Photo: Getty Images The croaking of frogs and toads is as much a part of spring as birdsong and gardening. When these animals go courting in ponds and ...