Summarize the following:
Rats that have entered a building do need to be removed before they can cause any damage, and the easiest way to catch them is with traps. There are many styles of traps out there, depending on your intention: Live traps are the most environmentally friendly and humane, because they don't kill the rats. Instead, they trap living rats so you can relocate them. Glue traps are extremely inhumane. Animals caught in them often cause themselves severe injuries trying to escape, and they usually die of starvation or dehydration. Snap traps are a less inhumane trap for dealing with rats when you intend to kill the animal. They are spring-loaded and designed to kill the rat quickly. Use a metal or quality plastic one that can be reused. Electrical traps are also less inhumane than glue traps, but are also designed to kill the animal. Trap placement is very important when you're trying to get rid of rats. Once they've established themselves in a building, rats will tend to follow the same paths over and over again, so if you don't get the traps in these locations, you may not catch them. Place your traps: Close to where you've found any droppings. Along the base of walls, at a 90-degree angle to the walls, and with the baited end closest to the wall. Out of the way of people, children, pets, and other wildlife. Two or three in a row, especially with spring traps, to stop the rat from just jumping over it. If you have pets or children in the home, you should take extra precautions to prevent them from getting hurt with a trap. Instead of leaving the traps out and exposed, place them inside a lidded cardboard box. Cut a square or round hole (about three to four inches) in either side of the box, and then place the box where you would normally put the trap. When you bait a snap trap, be sure the food is securely attached to the mechanism that trips the spring, and use the least bait possible to prevent the rat from just running off with it. There are many different foods you can use to bait a trap to catch a rat, but some of their favorites include: Peanut butter (either mix it with oats or spread it over a cotton ball) Pumpkin seeds Apples, bananas, or other fruit Meat, and especially bacon Vegetables, and especially corn Some traps, like a live or electric trap, you can set right away. But with snap traps, you may have to bait the trap once or twice before actually setting it. Rats can be quite cautious of new things in their environment, so if they set off a trap that's baited and set without being caught, they won't go near another one in the future. You can get them used to the trap by baiting it a few times without setting it, and allowing them to eat the bait. Once you've baited the trap a couple times and the rat has eaten the food, set the trap. For some snap traps, you'll just have to pull the lever back to set them, but with others you have to pull back the bar attached to the spring, then wedge the pin into the metal trigger. Never touch a wild rat without the protection of gloves, even if the animal is dead. With live traps, take the entire trap to a nearby field or forest, open the trap and let the animal escape. To deal with a dead rat, wrap the body in two plastic bags, sealing each separately. You can then dispose of the body according to local by-laws, such as by burying it or throwing it in the garbage. If you happen to find a live rat caught it a glue trap, you can free the animal by massaging cooking oil or mineral oil around the glue where the animal is stuck. Eventually the oil will remove the glue's stickiness, and the animal can then be freed and transferred to a shoe box for relocation.

Summary:
Select a trap style. Place the traps around the building. Keep pets and kids away from set traps. Bait the traps. Set the traps. Release or remove the rats you catch.