The sea lamprey is an ancient fish without jaws. It lives in the seas, attaches to other fish, and feeds on their blood, ascending rivers for reproduction.
The sea lamprey differs from other fish by the absence of jaws and the presence of a sucker with teeth. It regulates fish populations in the oceans but can cause significant harm in areas where it has become an invasive species.
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
Oral hood count
shallow coastal zones of rivers and lakes
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}
suction
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
Coconut
About health
marine coastal
fish blood
When your next birthday would fall if you lived as {name}
carrion
results
Colors
Sex
Upcoming jubilees
scavenging, eat already dead animals
Gremllins
mo
Dorsal fins count
Uses an excavated underground tunnel or chamber for refuge or nesting.
live fish
all seas and oceans
Trophic type
Filters
once in a lifetime
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)
Parasite
Age (from birth to death)
Age (embryo)
most of Europe and Asia, various forests, steppes and tundra
parasite
Wanderers
semelparity, the animal reproduces only once and soon dies after that
Jubilee = every 10th birthday
marine coastal demersal
Draws prey or water into the mouth by creating negative pressure.
Earliest developmental stage inside an egg or womb.
Business sausages
Lifespan average
water is almost always cold, there may be ice in winter, not hot in summer
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
microorganisms
metamorphosis / end of larval stage
fish
end of acceleration
Share
swampy freshwater biotopes — peat bogs, marshes, river mangroves
fish tissues
Find a pet...
Mature, fully developed individual capable of reproduction.
Freshwater
Cold sea
water is cool or warm, cold in winter, comfortable to swim in summer
from 0.5 to 0.8 kilograms, 0.5 – 1 meter
Pets
all rivers and lakes
freshwater cave
egg-laying
{name} jubilee
cm
Old-timers
Find an animal or breed...
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 seas and oceans
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
lakes and ponds
normal sexual
freshwater marsh and wetlands
Taxons
if born as {name}
age
birth date
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
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
detritus
burrow
Temperate sea
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
fresh water
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
{name} birthday
Nearctic realm
No results found
North America and Greenland, from tundra to forests
On the map
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?
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
Mouthpart modified to create suction for ingesting food or anchoring.
from birth to adulthood
nest
What do they eat?
Where do they live?
Immature individual that has not yet reached reproductive maturity.
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
saline marine habitat
This is me
freshwater
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
swap
freshwater environment — rivers, lakes, ponds, swamps
Sucker mouth count
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
Sucker mouth color
When you would have been born if you lived as {name}
Littoral Zone
Daddies
from development to adulthood
Gill pores count
Lifespan maximum
suction
Hermaphrodite ⚥
embryo
underground freshwater bodies — karst caves with water
summer warm, many oaks, birches, maples
Length
Sucker mouth size
kg
Observations
◉{N} more on tap