Mouse vs Rat: How to Tell the Difference
Size only settles mouse vs rat for adults. How to tell a young rat from an adult mouse by head, feet, ears and nose, how to separate Norway and roof rats, and which clues cannot prove anything.
Evidence and signs
Start from something you can see, hear, smell or measure: droppings, sounds, gnaw marks, nesting material, odours. Each guide ends with a decision, not a description.
When to Call an Exterminator for Mice or Rats — and When DIY Is Reasonable
A reason to act is not automatically a reason to hire. Only a few situations — rodents in the ductwork, a pregnant household member, multi-unit buildings, roof rats on utility wires — draw a firm line. Here is where the rest of the decision sits.
One Mouse or an Infestation? How to Tell What the Evidence Means
One sighting proves one mouse was there — nothing more. No authoritative source gives a mouse count that defines an infestation. What you can test is whether evidence keeps appearing after you clean, trap and monitor.
How to Know If Mice Are Gone: What Counts as Proof and What Doesn’t
No single sign proves a house is mouse-free. How to set a clean baseline, keep traps working and read what you find, using CDC’s clean-and-recheck method and its one-week trapping benchmark.
Scratching in Walls at Night: Mice, Rats, Squirrels, or Bats?
Night scratching in a wall is consistent with mice or rats, but wildlife specialists warn that noise is not a reliable way to identify a species. Here is what timing and location honestly narrow down, and the physical evidence that settles it.
Fresh vs old mouse droppings: how to tell if mice are still active
What fresh and old mouse droppings look like, why appearance cannot date them, and the check that shows whether mice are still active.
Do I Have Mice or Rats? How to Tell From the Signs
A calm, evidence-first guide to telling mice from Norway rats and roof rats — droppings, gnaw marks, burrows, and entry holes, each explained by what it can and can’t prove, sourced to CDC and university IPM.
Mouse droppings vs rat droppings
Size is the fastest way to tell which animal you have, and it changes what you do next. Compare the two at actual size against a ruler calibrated to your screen, then work out whether this is a weekend job or a phone call.