There are a lot of Instructables for trapping rodents but if you have more than one or two, trapping is really not a satisfactory option. This bait station is easily made from two plastic milk bottles and keeps the bait away from pets and birds.
Step 1: Tools
Several sizes of nails and heavy staples are also used.
Step 2: Materials
Cut the end off of both milk bottles and remove caps. The rats can enter through the top or bottom.
Cut a square hole in one, leaving about 25mm (1 inch) at the bottom end. Remove the cap. This will be the bottom.