Gyropteryx agassizii is an extinct lobe-finned fish from the Devonian period. It lived about 385 million years ago and had fins with a fleshy base.
Gyropteryx agassizii is important because it shows the transition from fins to limbs. Its structure helps understand how fish gave rise to land animals.
Legendary longevity: over 100 years. Galapagos tortoises, Greenland sharks, ocean quahogs celebrate with family once every 4 years
homogamy, reproduction always with fertilization, no alternation of generations
Immature form that undergoes metamorphosis before adulthood.
Offspring
Worker
Elders
Bro
birth time
normal sexual
Taxons
carnivore
if born as {name}
lakes
Jaws size
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
g
age
t
When your next jubilee falls in {name} life years
Human
birth date
rivers
Palearctic realm
no permanent shelter
rest
Close
was
days
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
The basics
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.
My weight?
small planktonic crustaceans — copepods, krill
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
adult
Maturity
fish of small size
primary food sources
teeth
Coconut
Potential Habitat
About health
Pectoral fins count
When your next birthday would fall if you lived as {name}
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
subterranean biotope — in soil, sediments, substrate
fresh water
Repro interval
results
Mass
protection from predators
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
Colors
Sex
{name} birthday
Upcoming jubilees
Gremllins
mo
Always hot
No results found
Trophic type
Filters
small fish
On the map
lunge
crustaceans
all life stages
Female ♀
Body color
Upcoming birthdays
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.
Truly long lives: 40-100 years. Bowhead whales, albatrosses, giant tortoises recall their birthday at most once a year
Lifespan
birth year
Maturity
Gills size
sq mm
yr
most of Europe and Asia, various forests, steppes and tundra
Wanderers
How similar?
spawning ground - place of egg-laying in a river or lake; the clutch may be guarded, covered, or a spawning pit
Jubilee = every 10th birthday
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
Earliest developmental stage inside an egg or womb.
Freshwater habitat consisting of flowing river channels and banks.
Business sausages
from birth to adulthood
Lifespan average
What do they eat?
small fish
Where do they live?
Immature individual that has not yet reached reproductive maturity.
Regeneration
early young
Hard dental structures used to bite, tear, or scrape food.
What do they look like?
Maturity
quick jaw snap
emergence (insects)
end of lifespan
Freshwater
How do they live?
fertilization / egg laying
How do they behave?
birth / hatching
soft or loose substrate — sand, silt, peat
metamorphosis / end of larval stage
end of acceleration
Share
Scales size
Duration
Find a pet...
Mature, fully developed individual capable of reproduction.
Freshwater
This is me
invertebrate larvae
Actively hunting and capturing live prey.
from 0.5 to 0.8 kilograms, 0.5 – 1 meter
Gamers
Pets
How are they built?
all rivers and lakes
mm
Theoretical lifespan
ml
Stars
Link copied
soil and substrate
My age?
wk
My size?
egg-laying
Scales color
{name} jubilee
Asexual
swap
cm
Old-timers
Find an animal or breed...
active predation
turns
Rabbits, falcons, red-eared turtles hang out for 6-9 years and party on their birthday four times a year
Rascals
Where do they take shelter?
aquatic larvae
celebrated their {n} birthday
When you would have been born if you lived as {name}
very hot all year round, frequent rains, but sometimes dry
Litter size
Daddies
Gills count
Lifespan maximum
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
Hermaphrodite ⚥
Where are they found?
Pectoral fins size
Species lacks any fixed or lasting shelter structure.
embryo
all rivers and lakes
Length
kg
Rapid forward strike to seize prey.
soft substrate
Observations
◉{N} more on tap