It is difficult to accurately estimate the total number of mice in the world, as they are found in a wide range of habitats and environments and their populations can fluctuate significantly over time. In the scientific setting, the term “mouse” refers to any of the 38 species that belong to the genus “Mus”.
These species are small, usually weighing under 30 grams and measuring less than 12 centimeters. Mice, as mammals, are closely related to rats.
Are Mouse and Rats the Same?
Rats and mice are both rodents, and though they share some physical traits, they differ significantly. Rats are larger and heavier. Mice have smaller, slender bodies, while rats are bulkier. Learn more.
Their tails set them apart too. A mouse tail is long, thin, and covered in fine hairs, whereas a rat’s tail is shorter, thicker, and bare. Body size and tail type are the easiest tells, but plenty of other physical and behavioural cues separate the two as well.
A quick look at the main ways to tell mice and rats apart:
- Size: Rats larger than mice
- Tails: Mice hairy, rats hairless
- Physical & behavioral differences
Habitat and Distribution of Mice
The 38 species of the Mus genus are native to Eurasia and Africa. These mice thrive in various habitats, from lowlands to mountaintops.
Mice are adaptable animals that can live in forests, fields, and urban areas due to their ability to thrive in varied environments and climates.
- 38 species in genus Mus
- Native to Eurasia and Africa
- Adaptable in various environments
Reproduction and Life Cycle of Mice
Female mice are receptive to mating every 4 to 5 days. If they conceive, they give birth to pups about three weeks later.
Mice breed quickly: one female can produce 6 to 8 pups per litter and have as many as 10 litters in a single year. That high reproduction rate is why their numbers build into dense populations and bounce back fast wherever they have been knocked down.
