The white-bellied thick-tailed mouse opossum is a small marsupial mammal from South America. It has a light belly and a tail in which fat accumulates for survival in dry periods.
It differs from other opossums by its very light belly and the ability to greatly thicken its tail due to fat. It helps maintain balance in nature by eating insects and becoming prey for predators.
homogamy, reproduction always with fertilization, no alternation of generations
Worker
Tail size
birth time
breeding
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
insects
About health
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
rains are very rare, almost a desert
little precipitation in winter, more in summer
Trophic type
Filters
summer very hot, dry, lots of grass
Upcoming birthdays
Breeding structure built or used for laying eggs and raising offspring.
nest inside a tree trunk or in a cave/crevice
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
Desert and dry shrubs
16 to 24 grams, 7 – 12 centimeters
in hollows and caves
Age (from birth to death)
Wanderers
Jubilee = every 10th birthday
dry, cold winter, lots of grass, few trees
Ears size
Earliest developmental stage inside an egg or womb.
Business sausages
fruits
Lifespan average
in a terrestrial nest
What do they look like?
Maturity
emergence (insects)
in the pouch or mouth
end of lifespan
How do they live?
fertilization / egg laying
How do they behave?
birth / hatching
metamorphosis / end of larval stage
end of acceleration
very dry and cold, very little snow and rain
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Mature, fully developed individual capable of reproduction.
Pouch count
Actively hunting and capturing live prey.
Pets
Primary oral structure used to seize, manipulate, or ingest food.
terrestrial shrubland
Hot steppe
Feeding occurs primarily on land or in vegetation.
{name} jubilee
paw
terrestrial shrub habitats — maquis, chaparral, bush
cm
Old-timers
Find an animal or breed...
small rodents
mouth
desert and semi-desert
turns
Rascals
Cold desert
terrestrial grassland and steppe
fruits
Tail color
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
°C
Not specified
Actively searching habitats to locate food items.
with mother
Where are they found?
steppe
Describes food handling or digging performed with the forelimbs.
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
normal sexual
Taxons
seeds, berries, fruits
if born as {name}
spiders
omnivore
age
birth date
small mammals — mice, shrews, bats
arid terrestrial biotopes with sparse vegetation
rest
Fur color
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
nocturnal
The basics
climbing
Neotropical realm
My weight?
active nocturnal search and prey catching
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
primary food sources
Neotropical realm
arid steppe
Potential Habitat
lots of grass, few trees, rains are rare
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
Mosquitoes, fruit flies, small crustaceans hustle for up to 7 months and throw a birthday party every week
terrestrial
Plants
small mammals
land
{name} birthday
Food is gathered directly from leaf surfaces.
grass
No results found
On the map
fry develop in the pouch or mouth of a parent on land
Pleasant summer
all life stages
Female ♀
Cold and almost dry
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
lots of grass, few trees, rains occur
Shelter used specifically for reproduction or nesting.
Maturity
terrestrial habitat, land surface outside water
sq mm
yr
comfortable summer, +20…+25 °C
protection from sun
How similar?
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?
spiders
Very dry
Neither
Moving up vertical surfaces like trunks or rocks to reach food.
Young offspring still dependent on parental care.
nest
What do they eat?
dry and cold almost all year round
Where do they live?
Ears color
Very hot and dry
Duration
live insects
This is me
Foraging activity occurs primarily during nighttime hours.
Steppe
Gamers
the mother carries the baby in a pouch or mouth on land
Teeth count
How are they built?
Temperate steppe
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
live spiders — arachnids of all sizes
very hot during the day, cold at night, almost no rain
terrestrial
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?
Denotes a grassland or steppe habitat preference.
inhabit and develop on land, outside water bodies
celebrated their {n} birthday
open grassy spaces — steppes, savannas, prairies
When you would have been born if you lived as {name}
Cold steppe
Daddies
Lifespan maximum
foraging
Hermaphrodite ⚥
Mandarin
embryo
Length
kg
very hot and dry, rare rains, cacti live
Observations
◉{N} more on tap