Rat
Rats make great pets, are very friendly and rarely bite.
They require a large cage but are straight forward to care for. Rats get a bad press but can make great fun pets for children and adults alike, they can be trained to do tricks and after time will learn their own name just like dogs and cats.
Male rats tend to be bigger but more docile so are probably more suited to younger children than the smaller and quicker female.
Rats on average liver between 2-3 years.