The black dallia is a small freshwater fish that lives in cold waters of Alaska, Chukotka, and Eastern Siberia. It can breathe air through a special esophagus and withstand almost complete body freezing.
The black dallia differs from other fish by its ability to breathe air and withstand body freezing in winter. It plays an important role in Arctic freshwater ecosystems as a predator and an object of study for adaptations to extreme cold.
Immature form that undergoes metamorphosis before adulthood.
Worker
birth time
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
shallow coastal zones of rivers and lakes
g
t
When your next jubilee falls in {name} life years
Human
very cold, short summer, almost no trees, lots of moss
days
worms
Esophagus temp
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
adult
Maturity
fish of small size
invertebrates
24 to 38 grams, 10 – 25 centimeters
About health
cool, lots of coniferous trees, snow in winter
Pectoral fins count
When your next birthday would fall if you lived as {name}
Repro interval
results
Colors
Sex
Upcoming jubilees
Gremllins
mo
all seas and oceans
Trophic type
all living animals without backbone
Filters
small fish
Palearctic realm
Upcoming birthdays
standing fresh waters — lakes, ponds, oxbow lakes
Truly long lives: 40-100 years. Bowhead whales, albatrosses, giant tortoises recall their birthday at most once a year
Lifespan
Age (juvenile)
insect larvae and caterpillars
Age (from birth to death)
Age (embryo)
most of Europe and Asia, various forests, steppes and tundra
Wanderers
Jubilee = every 10th birthday
Tundra
Earliest developmental stage inside an egg or womb.
Business sausages
Lifespan average
Rapidly swallows prey or food items whole without chewing.
Regeneration
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
swampy freshwater biotopes — peat bogs, marshes, river mangroves
Find a pet...
Mature, fully developed individual capable of reproduction.
Freshwater
very cold, lots of snow and ice
gulping
Actively hunting and capturing live prey.
Pets
all rivers and lakes
Primary oral structure used to seize, manipulate, or ingest food.
Nearctic realm
whole swallow
{name} jubilee
cm
Temperate coniferous forest
Old-timers
Find an animal or breed...
mouth
turns
Rascals
Flooded grasslands
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
Egg color
Where are they found?
Pectoral fins size
Species lacks any fixed or lasting shelter structure.
all rivers and lakes
Legendary longevity: over 100 years. Galapagos tortoises, Greenland sharks, ocean quahogs celebrate with family once every 4 years
Offspring
Elders
Bro
Very cold
lakes and ponds
freshwater marsh and wetlands
Taxons
carnivore
rivers and streams
if born as {name}
cold, short summer, almost no trees
age
birth date
no permanent shelter
Palearctic realm
freshwater coastal and creek
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
The basics
My weight?
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
young after transformation
primary food sources
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
Body size
{name} birthday
live annelid worms
Nearctic realm
No results found
North America and Greenland, from tundra to forests
On the map
lunge
all life stages
Female ♀
Body color
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
How similar?
Male ♂
until the celebration
Tundra
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
What do they eat?
insect larvae
Where do they live?
Marine world
from birth to death
early young
water often floods the land, lots of grass
Freshwater
Duration
saline marine habitat
This is me
most of Europe and Asia, various forests, steppes and tundra
freshwater
Gamers
How are they built?
marine
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
Taiga
Asexual
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?
celebrated their {n} birthday
When you would have been born if you lived as {name}
flowing fresh waters — rivers, streams, mountain torrents
Daddies
Lifespan maximum
whole life
Hermaphrodite ⚥
Tomato
North America and Greenland, from tundra to forests
embryo
Length
kg
Rapid forward strike to seize prey.
Observations
◉{N} more on tap