The brown deer mouse is a small rodent with a wide head, large eyes, and ears. It lives in the mountain forests of central Mexico and is active only at night.
The brown deer mouse differs from related species by its broader head and special tooth structure. It helps spread plant seeds and serves as food for snakes, owls, and other predators.
meadows, prairies, forb glades on land
homogamy, reproduction always with fertilization, no alternation of generations
Worker
Tail size
birth time
Describes the act of excavating soil or substrate to locate or access food.
Dogs, dolphins, lynx hang out for 9-25 years and party on their birthday three times a year
m
Map
will celebrate their {n} birthday
g
t
When your next jubilee falls in {name} life years
Human
days
South and Central America, hot and humid, huge forests
Warm summer
How old you would be if you lived as {name}
Theoretical maximum lifespan estimated from the Dynamic Energy Budget (DEB) mathematical model. This value reflects a biological potential derived from metabolic parameters, not from direct observation — real recorded lifespans are often significantly shorter.
adult
Maturity
South and Central America, hot and humid, huge forests
plants
insects
About health
cool, lots of coniferous trees, snow in winter
Searches for food on or among rocks and stony surfaces.
When your next birthday would fall if you lived as {name}
Repro interval
results
summer warm, winter not very cold
Colors
Sex
Upcoming jubilees
Gremllins
mo
hot, rains in summer, little precipitation in winter
Uses an excavated underground tunnel or chamber for refuge or nesting.
conifer cones
little precipitation in winter, more in summer
alpine meadows and arctic tundra on land
Trophic type
Filters
Warm winter with almost no precipitation
Upcoming birthdays
Breeding structure built or used for laying eggs and raising offspring.
eggs, roe or offspring develop in a nest built on the ground or close to it
Truly long lives: 40-100 years. Bowhead whales, albatrosses, giant tortoises recall their birthday at most once a year
Lifespan
leaf
Seeds
nest on the ground
young are born live on land, not hatched from eggs or roe
Age (juvenile)
Age (from birth to death)
cones of coniferous trees with seeds
rock
Hot, little precipitation in winter
Age (embryo)
Wanderers
Food items are collected from exposed outer surfaces of substrates.
Jubilee = every 10th birthday
Ears size
Tropical coniferous forest
Earliest developmental stage inside an egg or womb.
Business sausages
fruits
Lifespan average
nest located directly on the ground surface on land, only the mother provides parental care for the offspring
in a terrestrial nest
Whiskers size
live birth
What do they look like?
Maturity
emergence (insects)
end of lifespan
How do they live?
fertilization / egg laying
How do they behave?
birth / hatching
metamorphosis / end of larval stage
end of acceleration
Share
seeds
Find a pet...
Mature, fully developed individual capable of reproduction.
Actively hunting and capturing live prey.
digging
Pets
Primary oral structure used to seize, manipulate, or ingest food.
Feeding occurs primarily on land or in vegetation.
{name} jubilee
paw
Eyes size
cm
Temperate coniferous forest
Old-timers
Find an animal or breed...
mouth
turns
Rascals
terrestrial forest
terrestrial herbaceous
fruits
Tail color
Forages on tree limbs or woody stems within vegetation.
Litter size
Map data sources: Ecosystem classification — IUCN Global Ecosystem Typology (Keith et al., 2022), indicative distribution maps Keith et al. (2020), https://doi.org/10.5281/zenodo.3546513; Large Marine Ecosystems — NOAA LME Program; Bathymetry — GEBCO Bathymetric Compilation Group (2026), GEBCO_2026 Grid, https://doi.org/10.5285/4f68d5c7-45eb-f999-e063-7086abc036fa; Climate data — Generated using Copernicus Climate Change Service information; Species occurrence data — GBIF.org, Derived dataset "all animals", https://zveriki.com/dataset/dataset.tsv; Terrestrial ecoregions — RESOLVE Ecoregions 2017 (Dinerstein et al., 2017), CC BY 4.0
How to care for them?
Living from 25 to 40 years. Orangutans, bald eagles, African elephants celebrate their birthday twice a year
searching on the soil surface
°C
Not specified
alpine and arctic tundra
Actively searching habitats to locate food items.
Where are they found?
38 to 65 grams, 15 – 40 centimeters
Describes food handling or digging performed with the forelimbs.
Whiskers color
Low precipitation in winter
Legendary longevity: over 100 years. Galapagos tortoises, Greenland sharks, ocean quahogs celebrate with family once every 4 years
Offspring
Elders
Bro
winter dry and warm
normal sexual
Taxons
seeds, berries, fruits
if born as {name}
Forages within or on the surface of soil or substrate.
Foraging takes place among trees and woody vegetation.
omnivore
age
birth date
Head size
Fur color
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
nocturnal
The basics
herbivory, feed only on plant food
climbing
Neotropical realm
My weight?
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
Insects
surface
primary food sources
Neotropical realm
teeth
burrow
Potential Habitat
d
In husbandry
On the go from 1.3 to 3.5 years. Forest mice, anoles, rainbow fish party on their birthday once a month
Mass
cold winter, lots of coniferous trees: spruce, pine
Mosquitoes, fruit flies, small crustaceans hustle for up to 7 months and throw a birthday party every week
terrestrial
Gestation
land
{name} birthday
Food is gathered directly from leaf surfaces.
soil
Always hot
No results found
underground
Eyes color
On the map
Pleasant summer
all life stages
Female ♀
nest located directly on the ground surface on land
Map data sources: Ecosystem classification — IUCN Global Ecosystem Typology (Keith et al., 2022), indicative distribution maps Keith et al. (2020), https://doi.org/10.5281/zenodo.3546513; Large Marine Ecosystems — NOAA LME Program; Bathymetry — GEBCO Bathymetric Compilation Group (2026), GEBCO_2026 Grid, https://doi.org/10.5285/4f68d5c7-45eb-f999-e063-7086abc036fa; Climate data — Generated using Copernicus Climate Change Service information; Species occurrence data — GBIF.org, Derived dataset "all animals", https://zveriki.com/dataset/dataset.tsv; Terrestrial ecoregions — RESOLVE Ecoregions 2017 (Dinerstein et al., 2017), CC BY 4.0
Potential habitat modelled from GBIF occurrence data. Map © Zveriki.com, licensed under CC BY 4.0.
birth year
Maturity
Skin color
terrestrial habitat, land surface outside water
sq mm
yr
comfortable summer, +20…+25 °C
How similar?
hot, many coniferous trees, often in mountains
Male ♂
until the celebration
baby / chick
age as {name}
How do they breed?
On the go from 3.5 to 6 years. Hedgehogs, crows, lizards treat themselves to birthday snacks 6 times a year
What if eaten?
Neither
Moving up vertical surfaces like trunks or rocks to reach food.
from birth to adulthood
Young offspring still dependent on parental care.
nest
caring mother
What do they eat?
Where do they live?
Immature individual that has not yet reached reproductive maturity.
from birth to death
Ears color
green plants
Hard dental structures used to bite, tear, or scrape food.
forests on land — tropical, temperate, boreal
branch
Duration
live insects
This is me
Foraging activity occurs primarily during nighttime hours.
Gamers
How are they built?
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
terrestrial
Taiga
Asexual
swap
active predation
Rabbits, falcons, red-eared turtles hang out for 6-9 years and party on their birthday four times a year
Where do they take shelter?
Warm summer and lots of rain
inhabit and develop on land, outside water bodies
celebrated their {n} birthday
When you would have been born if you lived as {name}
very hot all year round, frequent rains, but sometimes dry
Daddies
Lifespan maximum
foraging
Hermaphrodite ⚥
embryo
Orange
Length
kg
lots of rain, warm and pleasant summer
arboreal
Observations
◉{N} more on tap