the best way to get a rat to take to you is put under your jumper and let it smell you they don't bite unless stressed unlike hamsters, they are very sociable animals, i had two for 3 years, there normal life span, they do leave little wee trails as markers to but this is not a health hazard , handling them then carefully and stroke their heads they'll soon get use to you mine use to follow me round the house,(be careful of cables etc they will chew through them ive been cut off the phone twice while talking cos they chewed the cable)