Pig Sounds is a free audio app that features a wide range of pig sounds from various breeds, from the ones you commonly hear like domesticated farm types to those that reside in the wild. This app uses a mixture of a sound library and a built-in microphone to capture sounds using a variety of techniques. The sounds are sampled and recorded in high-quality as either MP3 or WAV file formats. The resulting audio files are sorted into categories that are used to present the various types of pig sounds.