Nests are structures built by various animals, primarily birds, to hold their eggs and raise their young. They can be made from a variety of materials, including twigs, leaves, mud, and feathers. The design and location of a nest often depend on the species, with some birds choosing to build in trees, while others prefer ground or cliff locations. In addition to birds, many other animals create nests, such as rodents, insects, and reptiles. These nests serve as safe spaces for the young and provide protection from predators and harsh weather. The construction of a nest is often a critical part of the reproductive process for these animals.