Rodent/ˈrəʊdnt/ Definition 1 of 1Pro Tip 1/3Common Pests Rodents are often referred to as pests due to their habits of invading homes and farms. We called pest control to remove the rodents from our attic. Pro Tip 2/3Size Perception The term 'rodent' may imply small size, but some, like capybaras, are quite large. Despite their name, giant rodents can weigh as much as a person. Pro Tip 3/3Behavioral Traits Rodents are known for their gnawing behavior, which is how they maintain their teeth. The rodent kept gnawing on the wooden furniture.