The Japanese water shrew is a small mammal with a flat head. It lives in mountain streams of Japan, swims excellently, and hunts aquatic animals.
The Japanese water shrew is distinguished by its flat head and excellent swimming ability. It helps maintain balance in nature by eating many aquatic insects.
homogamy, reproduction always with fertilization, no alternation of generations
Immature form that undergoes metamorphosis before adulthood.
Worker
Tail size
birth time
Submerges underwater to reach prey or food at depth.
Vibrissae size
aquatic insects
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
Legs count
days
Warm summer
worms
How old you would be if you lived as {name}
crustaceans
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.
small planktonic crustaceans — copepods, krill
whiskers
adult
Maturity
fish of small size
24 to 38 grams, 10 – 25 centimeters
About health
When your next birthday would fall if you lived as {name}
nest built on land near a river, lake, pond or swamp
Repro interval
results
summer warm, winter not very cold
Colors
Sex
Upcoming jubilees
Gremllins
diving
mo
Uses an excavated underground tunnel or chamber for refuge or nesting.
Trophic type
Filters
small fish
Palearctic realm
in fresh water
Upcoming birthdays
standing fresh waters — lakes, ponds, oxbow lakes
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
in a burrow
Height
nest on the ground
rains almost always, very humid
young are born live on land, not hatched from eggs or roe
Age (juvenile)
insect larvae and caterpillars
Age (from birth to death)
Age (embryo)
most of Europe and Asia, various forests, steppes and tundra
Wanderers
Age (larva)
Jubilee = every 10th birthday
Warm summer and frequent rains
Earliest developmental stage inside an egg or womb.
Freshwater habitat consisting of flowing river channels and banks.
Business sausages
Lifespan average
nest located directly on the ground surface on land, only the mother provides parental care for the offspring
in a terrestrial nest
young after fast growth
Juvenile stage following larval metamorphosis but not yet adult.
live birth
summer warm, rains frequent
What do they look like?
Maturity
emergence (insects)
end of lifespan
How do they live?
fertilization / egg laying
Produces toxins capable of causing harm when delivered.
How do they behave?
birth / hatching
metamorphosis / end of larval stage
end of acceleration
Share
swampy freshwater biotopes — peat bogs, marshes, river mangroves
Find a pet...
Mature, fully developed individual capable of reproduction.
nest hidden in an underground burrow
Freshwater
Actively hunting and capturing live prey.
Pets
all rivers and lakes
Lots of rain and cool summer
lateral line
Legs size
{name} jubilee
cm
Old-timers
Find an animal or breed...
turns
Rascals
Tail color
dives and uses whiskers to search for prey
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.
Where are they found?
nest hidden in an underground burrow, only the mother provides parental care for the offspring
all rivers and lakes
larvae
insects living in water or near water — mayflies, caddisflies, stoneflies
lots of rain, cool summer, snow in winter
Legendary longevity: over 100 years. Galapagos tortoises, Greenland sharks, ocean quahogs celebrate with family once every 4 years
caring mother
Offspring
Elders
Bro
lakes and ponds
normal sexual
freshwater marsh and wetlands
Taxons
carnivore
if born as {name}
age
birth date
rivers
Head size
Palearctic realm
rest
Fur color
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
The basics
Venomous
My weight?
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
primary food sources
burrow
Potential Habitat
Very hot summer
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
Body size
land
summer very hot, above +25…+30 °C
{name} birthday
live annelid worms
aquatic insects
grass
No results found
On the map
Pleasant summer
crustaceans
all life stages
Female ♀
Body color
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
Shelter used specifically for reproduction or nesting.
Maturity
caring mother
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?
Neither
from birth to adulthood
Young offspring still dependent on parental care.
caring mother
What do they eat?
insect larvae
Where do they live?
moss
Immature individual that has not yet reached reproductive maturity.
from birth to death
mountains
early young
Freshwater
Temperate mixed forest
Duration
This is me
most of Europe and Asia, various forests, steppes and tundra
freshwater
Always very wet
Gamers
small fish
How are they built?
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
Asexual
nest near fresh water, only the mother shows parental care for the offspring
swap
freshwater environment — rivers, lakes, ponds, swamps
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
Sensory system detecting water movements to locate prey.
inhabit and develop on land, outside water bodies
Head color
celebrated their {n} birthday
When you would have been born if you lived as {name}
Daddies
Lifespan maximum
foraging
Hermaphrodite ⚥
Tomato
embryo
summer warm, many oaks, birches, maples
Denotes a mountainous habitat preference.
Length
kg
lots of rain, warm and pleasant summer
Observations
◉{N} more on tap