Mouse
House Mouse Facts
| Size | 2.7-3.9 inches (7-10 cm) |
| Speed | Up to 8 mph (12.8 km/h) |
| Weight | 0.7-0.8 ounces (20-25 grams) |
| Lifespan | 2-5 years |
| Food | Omnivore |
| Predators | Birds, cats, foxes, reptiles |
| Habitat | Worldwide |
| Order | Rodents |
| Family | Murids |
| Scientific name | Mus musculus |
| Characteristics | Small rodent, round ears, long and thin tail |
Main Characteristics
Mice are small rodents. Their most noticeable features include gray to brownish-gray fur, a long, slender tail, large ears, and round ears. They are highly intelligent and very social – they pass the mirror test and provide first aid to unconscious companions. However, they are considered pests because they nibble on our food and transmit diseases through their droppings and urine.
Species
There are 39 species. In the USA, the house mouse and the deer mouse are the most common species. In the forest, we encounter the wood mouse. Gardens often host voles (also a kind of mouse).
Origin
The mouse originally comes from Asia, where it was a steppe animal that fed on grass seeds. It arrived in Europe as a stowaway on ships and then spread to North America.
Name
The scientific name for the mouse is "mus musculus". The word "mus" comes from Sanskrit (ancient Indian) and means "thief".
Distribution and Habitat
In the wild, house mice inhabit fields, forests, hedgerows, gardens, and parks, where they dig small burrows with tunnels, chambers, nests, and three to four exits. Around humans, they like to reside in woodpiles, rafters, storage rooms, and other hidden spots near food.
Way of Life
Mice are nocturnal. At dusk, they venture out in search of food, eat, or store supplies. They are very social and live in groups.
Anatomy and Appearance
Size and Weight
A typical house mouse has a body length of 2.7-3.9 inches (7-10 cm) and a tail of about the same length. Its weight ranges from 0.7-0.8 ounces (20-25 grams).
Teeth
Mouse teeth are nearly as hard as diamonds. On the so-called "Mohs scale", diamonds rank at a hardness of 10, while mouse teeth are at 9.6.
House Mouse or Black Rat – What’s the Difference?
If you see a small, gray rodent scurrying by, you might wonder: Was that a mouse or a rat? Mice are small, light, have a long, very slender tail, and large, round ears. Rats are larger, heavier, have a thick, short tail, and smaller ears.
Diet
Mice are omnivores. They will eat just about anything that comes their way: plants, seeds, roots, leaves, insects (like beetle larvae, millipedes, cockroaches), carrion, and anything they find in the kitchen. This includes bread, oats, peanut butter, cake, chocolate, fruit, vegetables, and bacon. Although mice are often depicted with a piece of cheese, the myth that they love cheese is false. They will only eat it if there’s nothing else available. Unusual but true: they also consume glue, soap, and other household materials.
Behavior
Fearless Adventurers
Mice are very curious and explore their surroundings daily, remembering locations, paths, obstacles, food sources, and other things.
Senses and Abilities
Senses
House mice may have poor eyesight, but they possess an excellent sense of smell, taste, and hearing. They use their whiskers to detect changes in the air and to sense surfaces.
Intelligence
Mice are tiny creatures with even smaller brains. Yet, they are incredibly intelligent! They can recognize themselves in mirrors, create mental maps with escape routes, have unique songs, learn from humans, identify objects in photos, and even provide first aid to revive unconscious companions.
Life Expectancy
In the wild they mostly do not get older than 12-18 months.
Enemies and Threats
Natural Enemies
These animals love to feast on mice: house cats, foxes, weasels, ferrets, snakes, falcons, and hawks. However, their most formidable foe is likely the barn owl, which consumes about 25,000 mice each year!
Mice as Disease Carriers
It is often said that mice are dirty and unclean. However, they are actually quite tidy, as they designate different areas in their territory for sleeping and eating. Nevertheless, they are carriers of many bacteria, viruses, and diseases, such as salmonella, hantaviruses, flea-borne typhus, tularemia, and the plague.
Mouse in the House?
Clear signs of furry "roommates":
- Numerous small droppings near food sources
- Footprints or tail marks – especially visible on dusty surfaces
- Urine (either dried or fresh) glows under UV light
- A musky scent, particularly near food
- Unlike rats, mice climb into walls and make noises while doing so.
- Squeaking and nibbling sounds ;)
How To Identify House Mice by Their Droppings
The droppings of house mice are easy to identify. They are small, narrow, short, spindle-shaped "little sausages" that taper to a point at the ends. They measure no more than 0.1-0.3 inches (3-8 mm). In comparison, rat droppings can be as long as 0.6-0.7 inches (15-19 mm).
The House Mouse is Not a Pet
Is the gray house mouse a pet like the house cat or dog? While this small rodent often lives as a "subtenant" in human dwellings, it is not actually a pet. Mice that can be kept as pets include fancy mice, jumping mice, and desert hamsters.
Reproduction
Mating Season
In the wild, house mice breed only from April to September. However, those living near humans can reproduce year-round. A female mouse typically has about 5-10 litters a year, and in some cases, even up to 14.
Litter
A typical litter consists of 5 to 6 babies. At birth, these babies are only about 0.4-0.8 inches (1-2 cm) long and weigh 0.03-0.07 ounces (1-2 grams), being hairless and blind. After 14 days, they open their eyes, and by three weeks, they no longer rely on their mother's milk. Interestingly, female mice also nurse the young of their fellow species.
Nest
Mice love to build their nests from scraps of fabric, paper, or other soft materials. They resemble loosely woven balls and have a diameter of about 4-6 inches (10-15 cm).
Fun Facts
The Oldest Mouse in the World ...
... is Mickey Mouse! It was born in 1928 and is still alive! ;)
Gods
In ancient Greece, the god Apollo was sometimes referred to as Apollo Smintheus, which translates to "Apollo, the Mouse" in English. In temples dedicated to him, white mice were kept under the altar as a form of honor. Additionally, in India, a god is associated with this little rodent: the Hindu god Ganesha rides on a mouse.
Remedies for Illnesses
In the past, people believed that fried mice or mouse cakes could cure bedwetting. In ancient Egypt, a cooked mouse was once considered a remedy for various ailments, such as stomach pain. The Roman author Pliny suggested mixing mouse ash with honey to alleviate earaches. Smallpox, whooping cough, measles, and many other conditions were once treated by having patients consume cooked mice.
The Mouse Is Related To:
Animals in the Same Biome:
- Badger
- Barn Owl
- Black Rat
- Cat
- Cockroach
- Eurasian Jay
- European Hare
- Grey Heron
- Hedgehog
- Long-Eared Owl
- Microbat
- Mouse
- Rabbit
- Red Fox
- Red Squirrel
- Wolf
Sources:
- „Innate heuristics and fast learning support escape route selection in mice“ (https://www.cell.com)
- „Mice recognize 3D objects from recalled 2D pictures, support for picture-object equivalence“ (https://www.nature.com)
- „Visuotactile integration facilitates mirror-induced self-directed behavior through activation of hippocampal neuronal ensembles in mice“ (https://www.cell.com)
- „Reviving-like prosocial behavior in response to unconscious or dead conspecifics in rodents“ (https://www.science.org)
- „Detection and neural encoding of whisker-generated sounds in mice“ (https://www.sciencedirect.com)
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