The world's smallest frog is deaf, but scientists have now discovered that it can hear with the use of its mouth.

The tiny frog species known as Gardiner's Seychelles measures 1 centimeter in length and found in the western part of the Indian Ocean. Scientists first found it to be deaf due to the absence of its middle ear which is important for most animals to recognize sounds. This is what pushed researchers to dig deeper into what allows this small frog to communicate with other frogs.

Renaud Boistel of the French National Centre for Scientific Research led a team of other researchers to do a study which included loudspeakers in the home of the frogs right at the Seychelles Islands. The result? The Gardiner's Seychelles frogs went closer to the loudspeakers and even responded to the noise they are hearing -- a good indication that they can actually hear.

They performed an X-ray on one of the frogs to check on their lungs which were discovered weak since it was poorly developed. They then went to check the head but eventually discovered that it is the thin layers of tissue on the chamber of its mouth are what make the sound reach its inner ears.

Recent published studies at the Proceedings of the National Academy of Sciences (PNAS), it is the bones in the frog's mouth that amplify the sound waves to help it travel easy from its mouth and straight to its ears.

It is simply that amazing. The world's smallest frog is truly 'small but terrible.'