Nothing but their presence in the area and access. In winter rodent pressure increases everywhere. If they are in your home no mater where you see them thy spend most time in the attic. To get rid of them use rat sized snap traps placed there near access hatch and check daily. Bait with peanut butter OR slightly undercooked bacon it sounds funny but they cant resist it I got paid to get rid of them for about 40 yrs
People have food. The rats come for the garbage and any food they can steal.
rats
the causes of the plague was the fleas on the rats they bit the rats and then when the rats died they moved on to bite the humans
No, they can sometimes prevent them!
no
The two main causes were the rats and the fleas brought from Asia.
Why does mrs frisby not explore the rats home
Rat digs in the ground to make home.
White House in D.C.
White House in D.C.
burrows or nests
bubonic plague carried by rats and spread by fleas