Rodents (from Latin rodere, 'to gnaw') are mammals of the order Rodentia (/ r oʊ ˈ d ɛ n ʃ ə / roh-DEN-shə), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents.

Rodents are mammals with incisor teeth that constantly grow. While rodents vary in size, most rodents are fairly small and have short limbs. It’s also common for rodents to have long tails. Scientists have traced rodent fossils all the way back to the Paleocene era, which was around 66 to 56 million years ago!

2025年3月15日 · Rodents are one of the most diverse groups of mammals, found in nearly every habitat across the world. With over 2,000 species, these small but adaptable creatures play a crucial role in ecosystems, acting as prey for predators, seed dispersers, and even burrowers that help aerate the soil.

Rodents are animals that gnaw with two continuously growing incisors. Forty percent of mammal species are rodents, and they inhabit every continent except Antarctica. This list contains circa 2,700 species in 518 genera in the order Rodentia. [1]

6 天之前 · Rodents are mammals characterized by upper and lower pairs of ever-growing rootless incisor teeth. Rodents are the largest group of mammals, constituting almost half of the class Mammalia’s approximately 4,660 species. This is a list of selected rodents, arranged alphabetically by suborder and

2025年1月15日 · Rodents are a diverse group of small to medium-sized mammals characterized by a single pair of constantly growing incisors in both the upper and lower jaws. They typically have robust bodies, short limbs, and long tails.

2024年5月27日 · Rodents are mammals that have teeth and powerful jaws that are made for gnawing. The incisor teeth are long, continuously grow, and have deep, open roots. Most rodents are gregarious, though a few, like the groundhog and fat dormouse, live alone most of the time.

2025年3月8日 · rodent, (order Rodentia), any of more than 2,050 living species of mammals characterized by upper and lower pairs of ever-growing rootless incisor teeth. Rodents are the largest group of mammals, constituting almost half the …

2017年4月25日 · Rodents, mammals of the order Rodentia, represent about 40% of all mammalian species. They are found across the world in all continents with the exception of Antarctica where they inhabit a wide variety of habitats. They can be arboreal, semi-aquatic or fossorial in nature.

2020年10月29日 · Rodents are found–often in large numbers–in a wide range of habitats and on every continent except Antarctica. On this page you’ll find rodent facts and information that will provide you with an excellent introduction to these fascinating animals… What Is A Rodent? A rodent is a mammal in the order Rodentia.