One of the City's most effective ways to combat rodents is containerization. Because the residents we service use heavy duty plastic carts with tight fitting lids to contain garbage, residents are able to cut off one of the main sources of food in an urban rat's diet. These carts are free and are distributed by the department's Bureau of Sanitation. Use of these free carts, combined with the rodenticide we strategically place deep inside a rat's burrow, are the key reasons for the decline of rats in our city. If rats can't feed, rats can't breed.