Tylomys

Tylomys is a genus of rodents in the family Cricetidae. These mammals are commonly known as tumor mice or crestless rice rats. They are native to Central America, with species found in Mexico, Guatemala, Belize, Honduras, El Salvador, Nicaragua, and Costa Rica. Tylomys are medium-sized rodents, typically weighing between 100 and 300 grams. They have long, partially naked tails that are often longer than their bodies, and their fur is usually gray or brown on their backs and lighter on their undersides.

Tylomys species are primarily nocturnal and arboreal, meaning they are active at night and spend much of their time in trees. They inhabit a variety of forest environments, from tropical rainforests to cloud forests, and are often found near streams or other water sources. Their diet consists mainly of fruits, seeds, insects, and some vegetation. They are generally solitary animals, though they may share burrows or nesting sites.

The genus Tylomys contains several recognized species, including Tylomys nudicaudatus, Tylomys panamensis, and Tylomys tumbalensis. Their reproductive biology is not extensively studied, but like many rodents, they are believed to have a relatively short gestation period and produce multiple offspring per litter. Some species of Tylomys are considered to be of conservation concern due to habitat loss and fragmentation.