Eurasian beaver
Eurasian beavers are one of the largest living species of rodents and are the largest rodent native to Eurasia. They weigh around . In Norway, adult males average while females average , while another study found adults from the same country to average . By the average weights known, the Eurasian beaver appears to be the world's second heaviest rodent behind the capybara, but averaging slightly larger and heavier than the North American beaver. While the largest specimen confirmed on record weighed , the Smithsonian has reported that this species can exceptionally exceed . Typically, the head-and-body length is and the tail length is .
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.