Ethan Walker

Rodents live in an extraordinary variety of shelters. Some dig burrows that extend through soil for meters, some sleep in tree cavities, some build leafy nests high above the ground, and beavers may construct lodges surrounded by water or excavate dens into riverbanks. Other rodents use rock crevices, hollow logs, root systems, or existing cavities … Read more

Rodents do not experience the world through one dominant sense. Depending on the species and habitat, they may combine whisker-based touch, smell, hearing, vision, vibration, and body-position cues to find food, avoid predators, navigate, and interact with other animals. A rat exploring a dark passage, a squirrel moving through a sunlit canopy, and a mole-rat … Read more

Rodents communicate in far more ways than squeaks. Depending on the species and situation, they may use audible calls, ultrasonic vocalizations, scent marks, urine, glandular secretions, touch, grooming, posture, facial movements, tail signals, foot drumming, or vibrations that travel through the ground. No single communication system represents all of Rodentia. That diversity makes sense because … Read more

Rodents do not all eat the same foods. Seeds and nuts are important to many species, but Rodentia also includes grass eaters, leaf browsers, fruit eaters, root diggers, fungus eaters, insect hunters, and flexible omnivores. A beaver feeding on willow cambium, a capybara grazing on grasses, and a mouse taking seeds and insects are all … Read more

Rodent incisors keep growing because they are built for a life of heavy wear. These front teeth are used to cut, clip, scrape, open, and gnaw many kinds of material, so rodents continually produce new tooth tissue to replace what is lost at the biting edge. Growth by itself is only half of the system. … Read more

Rodents are not a single mouse-shaped kind of mammal. Rodentia includes familiar animals such as mice, rats, squirrels, chipmunks, prairie dogs, beavers, porcupines, guinea pigs, chinchillas, and capybaras, along with many less familiar lineages. What unites them is shared ancestry and a characteristic rodent dental pattern, not one body shape, habitat, diet, or lifestyle. There … Read more

Rabbits are not rodents. Rabbits and hares belong to the mammal order Lagomorpha, while mice, rats, squirrels, beavers, porcupines, guinea pigs, capybaras, and many other animals belong to Rodentia. The two orders are close evolutionary relatives, which helps explain why they share several features, including prominent gnawing incisors and a toothless gap behind those incisors. … Read more

A rodent is not simply a small mammal, a gnawing animal, or a creature that happens to have prominent front teeth. Rodents are members of the mammal order Rodentia, a branch of mammals united by shared ancestry and a distinctive set of skull and dental features. The most recognizable feature is one enlarged pair of … Read more

Rodents are mammals in the order Rodentia, a remarkably varied group that includes mice, rats, squirrels, chipmunks, marmots, prairie dogs, beavers, porcupines, guinea pigs, chinchillas, capybaras, and many less familiar animals. What unites them is not a shared lifestyle, body size, habitat, or relationship with people. Their defining pattern is anatomical and evolutionary, especially the … Read more