The European brook lamprey is a small jawless fish that lives in clean streams and rivers of Europe. It spends most of its life as a larva, which hides in the ground and filters water.
Unlike the sea lamprey, the brook lamprey does not attach to other fish and does not feed on their blood. It serves as an important indicator of water purity in streams and is part of the natural food chain.
homogamy, reproduction always with fertilization, no alternation of generations
Immature form that undergoes metamorphosis before adulthood.
Worker
birth time
Mouth count
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
Oral hood count
shallow coastal zones of rivers and lakes
g
summer mild, +15…+20 °C
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.
Captures food by straining water or substrate through specialized structures.
bacteria
adult
Maturity
organic debris
About health
When your next birthday would fall if you lived as {name}
results
Colors
Cool summer
Sex
Upcoming jubilees
Gremllins
mo
detritivore
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
standing fresh waters — lakes, ponds, oxbow lakes
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
Age (juvenile)
Age (from birth to death)
Age (embryo)
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
Draws prey or water into the mouth by creating negative pressure.
Earliest developmental stage inside an egg or womb.
Business sausages
Lifespan average
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
Egg count
Pets
all rivers and lakes
freshwater cave
egg-laying
{name} jubilee
cm
Old-timers
Find an animal or breed...
turns
Rascals
Flooded grasslands
on gravel
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
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
lakes and ponds
normal sexual
freshwater marsh and wetlands
Taxons
if born as {name}
age
birth date
swimming
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
primary food sources
detritus
burrow
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
lots of rain, summer not hot
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
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 ♀
water filtration
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
Egg size
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
from birth to death
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
from 11 to 16 grams, 1.5 – 12 centimeters
freshwater
Gamers
aquatic plants and algae
How are they built?
Cool summer and lots of rain
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
Taiga
Asexual
on fine pebbles and stones on the bottom of a freshwater body
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?
celebrated their {n} birthday
When you would have been born if you lived as {name}
Daddies
Lifespan maximum
Gill pores count
Hermaphrodite ⚥
Strawberry
embryo
underground freshwater bodies — karst caves with water
summer warm, many oaks, birches, maples
Length
kg
Observations
◉{N} more on tap