The sea otter is a large marine mammal from the mustelid family. It lives in cold coastal waters and has the densest fur among all animals, which protects it from the cold instead of a blubber layer.
Sea otters differ greatly from other mustelids because they spend almost their entire lives in the water and use tools. They are important for nature because they eat sea urchins and prevent them from destroying kelp forests, which serve as homes for many marine animals.
homogamy, reproduction always with fertilization, no alternation of generations
Worker
birth time
Submerges underwater to reach prey or food at depth.
Pelagic Ocean
Dogs, dolphins, lynx hang out for 9-25 years and party on their birthday three times a year
diving and using stones as tools
m
Map
will celebrate their {n} birthday
g
summer mild, +15…+20 °C
t
When your next jubilee falls in {name} life years
Human
days
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.
mollusks
adult
Maturity
Nightstand
crabs
sea urchins and stars
invertebrates
About health
marine coastal
milk
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 and almost no rain
summer warm, winter not very cold
Colors
Cool summer
Sex
Upcoming jubilees
Gremllins
diving
mo
live fish
all seas and oceans
Trophic type
all living animals without backbone
Filters
Upcoming birthdays
Winter with snow
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
Height
nest on the ground
rains almost always, very humid
young are born live on land, not hatched from eggs or roe
Age (juvenile)
Age (from birth to death)
rock
Age (embryo)
Wanderers
far from shore, deep water, large whales and sharks live here
Jubilee = every 10th birthday
marine coastal demersal
Earliest developmental stage inside an egg or womb.
marine coastal benthic
Business sausages
zones of mixing fresh and sea water — river deltas, estuaries
Lifespan average
water is almost always cold, there may be ice in winter, not hot in summer
nest located directly on the ground surface on land, only the mother provides parental care for the offspring
in a terrestrial nest
Cold Sea
live birth
What do they look like?
Maturity
emergence (insects)
end of lifespan
live echinoderms, sea stars, urchins, sea cucumbers
How do they live?
fertilization / egg laying
How do they behave?
birth / hatching
metamorphosis / end of larval stage
fish
protection from waves
end of acceleration
benthic biotope of coastal marine waters
Share
live snails, mussels, oysters
Find a pet...
Mature, fully developed individual capable of reproduction.
Cold sea
water is cool or warm, cold in winter, comfortable to swim in summer
Actively hunting and capturing live prey.
where the river flows into the sea, slightly salty water, lots of fish and birds
Pets
bivalve mollusks
Lots of rain and cool summer
{name} jubilee
sea urchins
cm
Temperate coniferous forest
Old-timers
Find an animal or breed...
turns
Rascals
drink mother's milk in childhood
Litter size
live crabs, shrimps, lobsters
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
Where are they found?
all seas and oceans
Species lacks any fixed or lasting shelter structure.
Paws count
Whiskers color
Summer almost without rain
lots of rain, cool summer, snow in winter
estuary and delta
Legendary longevity: over 100 years. Galapagos tortoises, Greenland sharks, ocean quahogs celebrate with family once every 4 years
Offspring
Elders
Bro
normal sexual
Taxons
carnivore
almost no rain in summer, more precipitation in winter
if born as {name}
age
birth date
no permanent shelter
rest
Fur color
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
Marine world
The basics
My weight?
demersal biotope of coastal marine waters
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
primary food sources
Temperate sea
after transformation until death
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
Gestation
land
{name} birthday
Nearctic realm
No results found
North America and Greenland, from tundra to forests
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
sq mm
yr
comfortable summer, +20…+25 °C
How similar?
water is almost always cold, there may be ice in winter, not hot in summer
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?
Where do they live?
Immature individual that has not yet reached reproductive maturity.
Marine world
much snow in winter, cold
River estuary into the sea
6 to 47 kilograms, 0.9 – 2.5 meters
Duration
fish
saline marine habitat
This is me
Warm summer with almost no rain
Always very wet
Gamers
Teeth count
How are they built?
marine
shallow near the shore, water rises and falls, crabs live here
mm
Theoretical lifespan
ml
Stars
Link copied
coastal marine zone — shelf, neritic zone
My age?
wk
My size?
Taiga
Asexual
water almost always cold, ice possible in winter, summers not hot
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}
Littoral Zone
Daddies
Lifespan maximum
Hermaphrodite ⚥
Cold sea
embryo
Length
kg
lots of rain, warm and pleasant summer
Observations
◉{N} more on tap