oh tami, i know exactly how you feel, RATS ARE DISGUSTING. and yes, they are very smart, and horribly nasty creatures. we had an infestation one year, and they were everywhere. i don't know why , just that one time, and we have lived here for 26 yrs. i kid you not. we probably killed 20-30 rats that spring & summer. in the house, out of the house. it was sooooo gross. thank the LORD, my son lived at home then, cuz my husband is gone alot. he is a truck driver. one day, my son set a trap and caught 3 in a matter of 30 min. i feel for ya. cuz , they are bad enough outside, but in the house it is awful. and, we have always had cats. we live in the country and have barn cats. they did not help that year. the only way i know, is either poison, which is not good inside, cuz then you have to find it. yuck! or a trap. traps are what we used. my dad had one crawl inside the wall and die one time, so ya have to be careful w/poison, cuz you never know where they are gonna die. man, sorry, hope you catch the varmit!
cathy