Mammals characterized by continuously growing incisor teeth used for gnawing, including rats, mice, squirrels, and beavers. They form the largest order of mammals.
From Latin 'rodere' meaning 'to gnaw.' The term was coined in the 18th century when scientists classified these animals based on their distinctive gnawing behavior and ever-growing front teeth.
Rodents are nature's ultimate success story, making up about 40% of all mammal species. Their secret weapon isn't just gnawing - it's their incredible adaptability, having colonized every continent except Antarctica and evolved into forms as diverse as flying squirrels and 100-pound capybaras.
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