The small-eyed squaretail is a marine fish with an elongated body and square caudal fin. It lives in deep ocean layers and feeds on gelatinous animals.
The square tail distinguishes this fish from other deep-sea species and helps in quick maneuvers. It is important in the ocean because it controls the population of gelatinous plankton and serves as food for large predators.
Immature form that undergoes metamorphosis before adulthood.
Worker
Tail size
birth time
Pelagic Ocean
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
live tunicates, sea tunicates — ascidians
g
t
When your next jubilee falls in {name} life years
Human
sea squirts
days
marine pelagic
How old you would be if you lived as {name}
jellyfish
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.
comb jellies
adult
Maturity
Coconut
marine benthic
About health
marine demersal
When your next birthday would fall if you lived as {name}
results
Colors
Sex
Upcoming jubilees
Gremllins
mo
all seas and oceans
Trophic type
Filters
Upcoming birthdays
live jellyfish
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
Age (larva)
far from shore, deep water, large whales and sharks live here
world of Australasia
Jubilee = every 10th birthday
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
Rapidly swallows prey or food items whole without chewing.
young after fast growth
Juvenile stage following larval metamorphosis but not yet adult.
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
Find a pet...
Mature, fully developed individual capable of reproduction.
Cold sea
gulping
Egg count
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
Primary oral structure used to seize, manipulate, or ingest food.
whole swallow
{name} jubilee
Eyes size
cm
Old-timers
Find an animal or breed...
mouth
turns
Rascals
Tail color
Abyssal Ocean
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
pelagic zone — open water far from shore and seabed
Where are they found?
all seas and oceans
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
Taxons
carnivore
if born as {name}
age
water is almost always warm, even in winter you can swim, very hot in summer
birth date
Palearctic realm
no permanent shelter
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?
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
primary food sources
Temperate sea
Potential Habitat
marine bathypelagic
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
Mosquitoes, fruit flies, small crustaceans hustle for up to 7 months and throw a birthday party every week
Body size
islands and part of Australia, many unusual animals and plants
Warm sea
{name} birthday
No results found
very deep, dark and cold, strange fish live here
Eyes color
On the map
all life stages
Female ♀
Body color
live ctenophores, gelatinous comb jellies in water
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
benthic zone — the bottom of the open sea
How similar?
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
from birth to adulthood
What do they eat?
Where do they live?
Immature individual that has not yet reached reproductive maturity.
from birth to death
Marine world
early young
Freshwater
Duration
saline marine habitat
This is me
Gamers
How are they built?
marine
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
Asexual
swap
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
the dark depths of the sea, below 1000 meters
Lifespan maximum
Hermaphrodite ⚥
embryo
Length
kg
near-bottom water layer of the open sea
Observations
◉{N} more on tap