our reporter has more t abinouf at the county's largest homeless camp. encampment, and the effort to try to find some kind of answers out here. ofany longer. >> i've been living here for 25 years. occasionally we used to have some, but now it's everywhere. they are huge. >> reporter: this man is talking about the rats seen here in infrared video taken from the sonoma counter sheriff department helicopter. along with this video, but county announced a rat control operation that will begin on monday. poisons will not be used. instead, females will be baited with a non-toxic sterilizer. >> honestly if we were just to clean up after ourselves, and store things properly, >> reporter: this man is one of the approximately 200 people living on the trail. he admits that rats are a problem here. >> not to the point that we need them to come and take care of it for us. >> reporter: rat infestation is just one of the problems. there have also been fires and episodes of >>d meol.docegsen i yard. so they protect our stuff. there's an issue here. it's very big. >> repo