By 12 weeks, the tail has regressed. When a frog swallows a meal, his bulgy eyeballs actually close and go down into his head, helping to apply pressure to push the meal down the frog's throat. It's size and the distance between them depends on the wavelength of the male frog's call. The frog's ears are connected to their lung, so when they hear noises, not only does the eardrum vibrate, but also the lungs. Frogs vocalize by shutting their nostrils and mouths and squeezing their lungs, expanding their vocal pouches as a resonating chamber by air flowing over the vocal chords.
Large frogs have deep, low frequency voices.
In the cold, the frogs repeat their calls more slowly because the muscles controlling the sounds slow down. Frogs which swim have webbing between their toes. In captivity, most frogs live between 4 and 15 years. Little is known about their lifespan in nature. Here are some lifespans in captivity.