The Ukrainian lamprey is a small freshwater fish without jaws. It lives in rivers of Eastern Europe, spends most of its life as a larva in bottom silt, and does not attack other fish.
The Ukrainian lamprey differs from marine lampreys in that it does not parasitize fish and does not feed in adulthood. Its larvae clean river water from organic remains and serve as an important part of river ecosystems.
homogamy, reproduction always with fertilization, no alternation of generations
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
riverbed
g
t
When your next jubilee falls in {name} life years
Human
detritus, eat dead remains of plants, animals and all kinds of organic debris on the bottom
days
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.
spawning ground in fresh water, father shows parental care for the clutch
Captures food by straining water or substrate through specialized structures.
bacteria
adult
Maturity
organic debris
South and Central America, hot and humid, huge forests
About health
When your next birthday would fall if you lived as {name}
filtering through mouth and gills
results
Colors
Sex
Upcoming jubilees
Gremllins
mo
detritivore
Dorsal fins count
Uses an excavated underground tunnel or chamber for refuge or nesting.
all seas and oceans
Trophic type
Filters
once in a lifetime
Palearctic realm
Upcoming birthdays
Breeding structure built or used for laying eggs and raising offspring.
Truly long lives: 40-100 years. Bowhead whales, albatrosses, giant tortoises recall their birthday at most once a year
Lifespan
16 to 24 grams, 7 – 12 centimeters
Age (from birth to death)
most of Europe and Asia, various forests, steppes and tundra
Wanderers
semelparity, the animal reproduces only once and soon dies after that
algae
Jubilee = every 10th birthday
Egg membrane size
Draws prey or water into the mouth by creating negative pressure.
Earliest developmental stage inside an egg or womb.
Business sausages
Lifespan average
Oral hood size
Regeneration
What do they look like?
Maturity
emergence (insects)
Tail fin size
end of lifespan
How do they live?
fertilization / egg laying
How do they behave?
birth / hatching
microorganisms
metamorphosis / end of larval stage
end of acceleration
Share
Find a pet...
Mature, fully developed individual capable of reproduction.
Freshwater
Pets
all rivers and lakes
Primary oral structure used to seize, manipulate, or ingest food.
Lots of rain and cool summer
egg-laying
{name} jubilee
Eyes size
cm
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
Where are they found?
all rivers and lakes
lots of rain, cool summer, snow in winter
Locomotion through water employed while searching for or capturing prey.
Legendary longevity: over 100 years. Galapagos tortoises, Greenland sharks, ocean quahogs celebrate with family once every 4 years
Offspring
Elders
Bro
normal sexual
Taxons
if born as {name}
age
birth date
swimming
caring father
Palearctic realm
Gill openings count
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
The basics
Neotropical realm
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
detritus
burrow
gills
Potential Habitat
suction
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
Feeding occurs in water bodies such as rivers, lakes, or oceans.
fresh water
Mass
Mosquitoes, fruit flies, small crustaceans hustle for up to 7 months and throw a birthday party every week
inhabit and develop in rivers, lakes, ponds, swamps, streams, and puddles
Body size
aquatic
{name} birthday
No results found
On the map
all life stages
Female ♀
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?
spawning ground - place of egg-laying in a river or lake; the clutch may be guarded, covered, or a spawning pit
Male ♂
until the celebration
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
nest
What do they eat?
Where do they live?
Marine world
early young
water often floods the land, lots of grass
bacteriophagy, specifically catch and eat tiny bacteria and other microbes
Freshwater
Temperate mixed forest
Duration
filter feeding
This is me
most of Europe and Asia, various forests, steppes and tundra
freshwater
Gamers
aquatic plants and algae
How are they built?
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
Asexual
swap
freshwater environment — rivers, lakes, ponds, swamps
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
celebrated their {n} birthday
When you would have been born if you lived as {name}
Daddies
Lifespan maximum
Hermaphrodite ⚥
Mandarin
embryo
gravel bottom
summer warm, many oaks, birches, maples
Length
Sucker mouth size
kg
lots of rain, warm and pleasant summer
Observations
◉{N} more on tap