A squirrel is a small, agile rodent that is found in many parts of the world. They are known for their bushy tails, which they use for balance, communication and warmth. Squirrels are typically active during the day, spending much of their time climbing trees and gathering food, such as nuts and seeds. They have sharp claws that allow them to grip onto the bark and other surfaces and are able to leap several feet in a single bound. Squirrels are considered pests by some, as they can cause damage to trees and gardens, and may also invade homes in search of food and shelter. However, many people enjoy watching these lively creatures in their natural habitat.