examples of rodents [2]
beaver 
Amphibious rodent found in Eurasia and North America prized for its fur; it uses branches to build lodges and dams in streams.
guinea pig 
Rodent originating in South America, sometimes domesticated but mainly used in laboratory experiments.
rat 
Omnivorous rodent characterized by its intelligence; it can transmit certain viruses and bacteria to humans. Some species are domesticated.
groundhog 
Rodent of the Northern hemisphere prized for its fur; it hibernates six months a year and emits a high-pitched whistle when in danger.
porcupine 
Rodent found on land and in trees in warm and temperate regions; its body is covered with long sharp quills, which it raises to defend itself.