Caviidae
Caviidae, the cavy family, is composed of rodents native to South America and includes the domestic guinea pig, wild cavies, and the largest living rodent, the capybara. They are found across South America in open areas from moist savanna to thorn forests or scrub desert. This family of rodents has fewer members than most other rodent families, with 19 species in 6 genera in 3 subfamilies.
Rodent
Some rodent species are serious agricultural pests, eating large quantities of food stored by humans. For example, in 2003, the amount of rice lost to mice and rats in Asia was estimated to be enough to feed 200 million people. Most of the damage worldwide is caused by a relatively small number of species, chiefly rats and mice. In Indonesia and Tanzania, rodents reduce crop yields by around fifteen percent, while in some instances in South America losses have reached ninety percent. Across Africa, rodents including "Mastomys" and "Arvicanthis" damage cereals, groundnuts, vegetables and cacao. In Asia, rats, mice and species such as "Microtus brandti", "Meriones unguiculatus" and "Eospalax baileyi" damage crops of rice, sorghum, tubers, vegetables and nuts. In Europe, as well as rats and mice, species of "Apodemus", "Microtus" and in occasional outbreaks "Arvicola terrestris" cause damage to orchards, vegetables and pasture as well as cereals. In South America, a wider range of rodent species, such as "Holochilus", "Akodon", "Calomys", "Oligoryzomys", "Phyllotis", "Sigmodon" and "Zygodontomys", damage many crops including sugar cane, fruits, vegetables, and tubers.