With that being said the easiest way to distinguish between rat and mouse droppings is to analyze the size of the droppings and their shape.
Roof rat droppings vs mouse droppings.
Roof rat droppings are very similar to the house mouse but much thicker.
Typically the length will still be the same but the thickness will be much greater than the typical field mouse.
Medical articles and infographics.
They are different sizes.
It s fairly easy to tell the difference between rat and mouse droppings.
They are shaped like a sausage curved with ends that are rounded and pointy.
They may be of different forms or sizes.
But a rat pellet is way bigger much fatter with rounded ends.
In comparison to rat droppings they are small with either one end pointed or both ends pointed.
Droppings are typically found around where these creatures eat.
A norway rat has capsule shaped feces while a roof rat has spindle shaped droppings and a house mouse has rod shaped excrement.
Rodent feces can carry harmful bacteria diseases and viruses including the hantavirus.
Droppings from the roof rat middle is a little smaller than the poop from a norway rat and has tapered ends.
Norway rat poop droppings norway rat poop droppings are even thicker that the roof rats and typically much shorter than field mice and roof rats.
You can see that a house mouse turd is like a small grain of rice even smaller than that often with pointy ends.
Rat or squirrel droppings.
Rat droppings are bigger than mouse droppings and measure around 3 4 th of an inch in length and around 1 8 th of an inch diametrically.
Look at the below photos.