* Droppings: Rats leave dark, tapered droppings about 10-14mm long. Mice leave small, dark droppings particularly along walls and in storage areas or under sinks in houses.
* Scratching noises as mice and rats scurry around.
* Distinctive smell: Both mice and rats leave an ammonia-like smell that will be particularly strong in enclosed areas.
* Damage: Mice and rats have teeth that grow continuously and gnaw on a variety of farm and household objects to keep them trim. Rodents can cause fires by chewing through cables and damage farm machinery.
* Ripped feed packaging: Rodents will tear open feed bags and may leave teeth marks.
* Nests: Rats and mice build nests in warm, hidden places using shredded material such as hay, straw, newspaper and various fabrics.
* Grease marks: Rats tend to leave dirt or grease marks along walls and floors. If these obvious signs are not present, examine the surroundings for rat runs. These tracks are left in grass and low vegetation and act as foraging paths for rodents. Rats tend to follow the same paths after they have been established.
Lay some plain flour along the edge of the floor by the walls or on surfaces close to where you think the nest might be. You'll notice tracks in the powder within a few days if the nest is close.