Piezoelectric materials are applicable in the biomedical field, and if they can be biocompatible and degradable, it will be a big step towards real applications. Recently, a research team at City University of Hong Kong (CityU) developed a simple exfoliation method to prepare ultrathin films of small intestine tissues from sheep. This biological tissue has been considered to have no piezoelectric properties at the macroscale, but the CityU research team discovered that if the material is ultrathin, it can show piezoelectricity. With its natural biocompatibility, the team believes that such piezoelectric biomaterial can likely be used in various biomedical applications, such as sensors and smart chips.