Not only squirrels, but various other animals also engage in nest-building activities. Ground squirrels and flying squirrels, in addition to their arboreal counterparts, construct nests for shelter. Moreover, numerous rodents like mice, rats, and hamsters utilize materials such as grass, leaves, and twigs to create their nests.

Beyond the realm of rodents, nest-building behavior extends to other mammals as well. Some primates, like orangutans, exhibit remarkable skills in constructing intricate nests high up in trees using branches and leaves. Similarly, certain marsupials, including the North American opossum, rely on leaves, grass, and sticks to build their nests.

Different strategies are employed by various mammals to secure a safe dwelling. Bears and badgers, for instance, dig dens or burrows in the ground, while raccoons and certain bat species opt for tree hollows or other natural cavities as their nesting sites. These diverse nesting behaviors highlight the resourcefulness and adaptability of mammals in creating suitable habitats for themselves and their young.