Mice and Rat Droppings

droppings from rodents and roaches When inspecting for rodent droppings, do not confuse the smaller mice dropping with roach excrement. Cockroach droppings are smaller and more slender than mice droppings and have a distinct ridge along the edges. The larger American roach dropping is blunt on end. Squirrel droppings are similar to rat droppings but have a twist at the midpoint of the dropping.
Excellent picture is from NY State IPM Program.

rodent droppings The droppings on the left are from mice; the ones to the right are from roof rats or squirrels. Rodent droppings are known to be harmful. Not only do they contaminate foods and cause allergic reactions in people, but they can also transmit bacteria and diseases. The hantavirus is associated with mice droppings through inhalation. See the safety tips below for inspection and removal of rodent droppings.

Tips for Safe Handling Of Rodent Droppings

  • Use gloves and facemasks when handling rodent feces.
  • Prevent hazardous particles in the droppings from becoming air borne. Do not stir up dust by vacuuming, sweeping, or any other means.
  • Mix 1½ cups of household bleach in 1 gallon of water. Once everything is soaked for 10-30 minutes, remove all of the nest material, mice or droppings with damp paper or disposable towels
  • Mop or sponge the area with bleach solution.
  • Wash hands and clothes thoroughly afterwards

Rodent Types and Pellet Droppings Characteristics


Qty: 50-75 pellets a day
Size: 1/4" long
Shape: Small, one or both ends pointed

Norway Rats

Qty: 40-50 pellets a day
Size: 3/4" long
Shape: Retanular, larger with blunt ends. They are found in small groupings.

norway rat feces

Roof Rats

Qty: 40-50 pellets a day
Size: 1/2" long
Shape: Curved, oblong shaped with pointed ends.They are scattered.

roofrat droppings