If so, you likely have a rat or mouse in the house. To address this annoying issue properly, you’ll need to find out which critter is invading your home. ... • Gray, black, ...

Mouse droppings are black and can be mistaken for those of rats or cockroaches. Both types of rodents can produce a large number of droppings daily—40 to 100 for mice and 20 to 50 for rats.

Owls have a name for a white mouse on a black rock: "dinner." Scientific studies (not to mention simple logic) have shown that mice whose coloration doesn't match their surroundings are easier ...