quirrels breed once or twice a year and give birth to a varying number
of young after three to six weeks, depending on species. The young are
born naked, toothless, and blind. In most species of squirrel, only the
female looks after the young, which are weaned
at around six to ten weeks of age and become sexually mature at the end
of their first year. Ground-dwelling species are generally social
animals, often living in well-developed colonies, but the tree-dwelling
species are more solitary