Myomorphs

Myomorphs are a large and diverse infraorder of rodents, primarily characterized by their cheek pouches. The name "myomorph" literally translates to "mouse-shaped," reflecting the common appearance of many species within this group. They are found on every continent except Antarctica, inhabiting a wide range of environments from deserts and forests to grasslands and urban areas.

These rodents are characterized by a number of skeletal features, including a specific arrangement of the jaw muscles and a relatively simple skull structure. A defining trait is the presence of fur-lined cheek pouches, which are used to transport food and nesting materials. The diet of myomorphs varies greatly depending on the species, but many are omnivores, feeding on seeds, fruits, insects, and sometimes even small vertebrates.

The infraorder Myomorpha includes several well-known families, such as the Muridae (which encompasses rats and mice), Cricetidae (voles, hamsters, and lemmings), and Dipodidae (jerboas and jumping mice). This diversity contributes to a wide range of sizes and lifestyles, from the tiny harvest mouse to larger species like the norway rat. Myomorphs play important ecological roles as prey animals for various predators and as seed dispersers. They are also of significant interest to humans, both as agricultural pests and as common laboratory animals.