Perognathus Flavus is the scientific name for the San Joaquin pocket mouse, a species native to California. There are several synonyms for Perognathus Flavus, including Heteromys flavus, Perognathus cerebrinus, and Chaetodipus flavus. These different names were given due to different interpretations of the mouse's physical characteristics, behavior, and habitat. Regardless of its name, this tiny pocket mouse plays an important role in the ecosystem of its native habitat by consuming insects and seeds and providing food for predators such as birds of prey and snakes. Protecting and preserving this species is crucial for maintaining the balance of the ecosystem.