The wrestling halfbeak, or Dermogenys pusilla, is a small freshwater fish up to 7 centimeters long. It lives in the waters of Southeast Asia and is known for males locking lower jaws during duels.
The wrestling halfbeak differs from related species by the males' behavior, who conduct jaw duels without serious injuries. The fish is important for nature because it eats insect larvae and serves as food for larger predators.
Worker
birth time
Lower jaw count
Dogs, dolphins, lynx hang out for 9-25 years and party on their birthday three times a year
daphnia
m
Map
will celebrate their {n} birthday
g
t
When your next jubilee falls in {name} life years
Yolk sac count
Human
Litters lifetime count
very hot and very humid all year round, rain almost every day
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.
adult
Maturity
Size male size
insect larvae
insects
About health
live tubifex
Andropodium color
When your next birthday would fall if you lived as {name}
Repro interval
Lateral stripe color
results
temperature for housing
Southeast Asia and islands, always hot and humid
Colors
Sex
Upcoming jubilees
Gremllins
mo
Lower jaw size
all seas and oceans
Trophic type
Filters
age diag byOther
always hot and humid, huge trees and vines
Upcoming birthdays
standing fresh waters — lakes, ponds, oxbow lakes
Truly long lives: 40-100 years. Bowhead whales, albatrosses, giant tortoises recall their birthday at most once a year
Lifespan
insect larvae and caterpillars
Age (from birth to death)
bloodworm
Wanderers
Food items are collected from exposed outer surfaces of substrates.
Jubilee = every 10th birthday
Lower jaw color
Minimum space
Earliest developmental stage inside an egg or womb.
Business sausages
Lifespan average
nutrition food name live insects
artemia nauplii
What do they look like?
Maturity
emergence (insects)
end of lifespan
hot, there is a dry season, trees shed their leaves
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
Carbohydrates
Find a pet...
Mature, fully developed individual capable of reproduction.
Freshwater
Andropodium size
copper excess
Actively hunting and capturing live prey.
where the river flows into the sea, slightly salty water, lots of fish and birds
Pets
all rivers and lakes
Indomalayan realm
Indomalayan realm
Tropical dry broadleaf forest
{name} jubilee
nitrites and ammonia
cm
Old-timers
Find an animal or breed...
turns
Rascals
Fat
Dorsal fin count
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
Actively searching habitats to locate food items.
Where are they found?
Species lacks any fixed or lasting shelter structure.
all rivers and lakes
mammal meat
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
live midgies
Offspring
Tropical moist forest
carbon tetrachloride
Elders
Bro
Size female size
lakes and ponds
freshwater marsh and wetlands
Taxons
carnivore
if born as {name}
age
birth date
Protein
swimming
no permanent shelter
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
The basics
My weight?
bakery products
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
young after transformation
surface
3 to 8 grams, 0.5 – 5 centimeters
primary food sources
Lateral stripe count
teeth
Potential Habitat
Water
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.
Mass
Mosquitoes, fruit flies, small crustaceans hustle for up to 7 months and throw a birthday party every week
Gestation
Body size
aquatic
age diag byColoration
{name} birthday
age diag bySize
No results found
On the map
lunge
small crustaceans
Female ♀
all life stages
Body color
live guppies and neons
small aquatic insects
Body temperature
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
Body count
How similar?
Male ♂
until the celebration
baby / chick
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?
sessile ciliates
Neither
from birth to adulthood
Young offspring still dependent on parental care.
What do they eat?
insect larvae
Where do they live?
Immature individual that has not yet reached reproductive maturity.
Marine world
artemia
Hard dental structures used to bite, tear, or scrape food.
River estuary into the sea
Freshwater
Duration
live insects
Always hot and wet
This is me
live surface insects
freshwater
Gamers
How are they built?
shallow near the shore, water rises and falls, crabs live here
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
temperament
Dorsal fin color
Asexual
swap
freshwater environment — rivers, lakes, ponds, swamps
Iodine
Southeast Asia and islands, always hot and humid
active predation
Rabbits, falcons, red-eared turtles hang out for 6-9 years and party on their birthday four times a year
nacl
Where do they take shelter?
Calcium
celebrated their {n} birthday
When you would have been born if you lived as {name}
Littoral Zone
dry cereals and hay
Daddies
small crabs, amphipods and other crustaceans
Lifespan maximum
foraging
Berry
whole life
small earthworms
Hermaphrodite ⚥
embryo
Length
kg
Rapid forward strike to seize prey.
Andropodium count
Observations
◉{N} more on tap