Rodentia

Rodentia is an order of mammals also known as rodents. They are characterized by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing. This large order is divided into three suborders, about 33 families, and more than 2000 species.

Characteristics

Rodents are characterized by their sharp incisors that continuously grow throughout their lives. These incisors are used for gnawing wood, breaking into food, and biting predators. Most rodents have long, sharp claws and many have long, sensitive whiskers.

Classification

The order Rodentia is divided into three suborders: Sciuromorpha, Myomorpha, and Hystricomorpha. These are further divided into about 33 families, which include well-known groups such as rats, mice, squirrels, and porcupines.

Evolution

Rodents are believed to have evolved over 50 million years ago in Asia. They have since spread to all parts of the world, except Antarctica, New Zealand, and certain oceanic islands.

Behavior

Rodents have adapted to a wide range of habitats. Some species are arboreal while others live on the ground. Some are social, living in large colonies, while others are solitary.

Impact on humans

Rodents have significant impacts on humans. Some species are considered pests, damaging crops and spreading diseases. Others are used in scientific research or kept as pets.

See also

• List of rodents
• Rodent model
• Rodent of unusual size

References

Rodentia Resources
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