Rat snakes are a large, polyphyletic, group of snakes from the Colubri subfamily Colubrinae. Many species tend to be very skittish and sometimes aggressive but the genus is nonvenomous and bites are usually superficial. A variety of species like Elaphe guttata guttata are known for the ease with which they are tamed and are common in the pet trade. There is considerable variation between different types of rat snake but most are medium to large, rodent eating snakes.