The black-tailed deer is a large mammal from the deer family. It lives in the western part of North America in forests, mountains, and shrublands.
The black-tailed deer differs from the white-tailed deer by its black tail and a special leap on all four legs. It is important for nature as a herbivorous animal and food for wolves, cougars, and other predators.
Antlers color
pecking
Worker
Tail size
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
g
summer mild, +15…+20 °C
t
When your next jubilee falls in {name} life years
Human
days
Warm summer
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
Nightstand
About health
milk
cool, lots of coniferous trees, snow in winter
When your next birthday would fall if you lived as {name}
Repro interval
results
summer warm and almost no rain
land coast flooded by tides — salt marshes, littoral zone
protection from predators
summer warm, winter not very cold
Colors
Cool summer
Sex
Upcoming jubilees
Gremllins
mo
rains are very rare, almost a desert
bush shoots
alpine meadows and arctic tundra on land
Trophic type
Filters
Captures or processes food by biting or nipping with the mouth.
summer very hot, dry, lots of grass
Tail count
young shoots and sprouts
leaves
grass
Upcoming birthdays
Winter with snow
eggs, roe or offspring develop in a nest built on the ground or close to it
Truly long lives: 40-100 years. Bowhead whales, albatrosses, giant tortoises recall their birthday at most once a year
Lifespan
leaf
nest on the ground
Desert and dry shrubs
rains almost always, very humid
young are born live on land, not hatched from eggs or roe
bark
Age (juvenile)
Age (from birth to death)
Age (embryo)
Wanderers
Jubilee = every 10th birthday
dry, cold winter, lots of grass, few trees
berries
Ears size
Earliest developmental stage inside an egg or womb.
Business sausages
Lifespan average
nest located directly on the ground surface on land, only the mother provides parental care for the offspring
in a terrestrial nest
leaves
Regeneration
live birth
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.
Pets
Nearctic realm
Repeatedly strikes or probes substrate with beak to obtain food.
juicy berries — bilberry, rowan, rosehip
biting
Lots of rain and cool summer
Hot steppe
Feeding occurs primarily on land or in vegetation.
{name} jubilee
cm
Temperate coniferous forest
Old-timers
Find an animal or breed...
turns
Rascals
terrestrial forest
terrestrial intertidal
Tail color
drink mother's milk in childhood
Ears 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
temperate forest
How to care for them?
Living from 25 to 40 years. Orangutans, bald eagles, African elephants celebrate their birthday twice a year
grazing
°C
Not specified
alpine and arctic tundra
Where are they found?
Species lacks any fixed or lasting shelter structure.
Antlers count
herbivore
Summer almost without rain
lots of rain, cool summer, snow in winter
Feeds by cropping or nibbling low-growing vegetation or algae.
Legendary longevity: over 100 years. Galapagos tortoises, Greenland sharks, ocean quahogs celebrate with family once every 4 years
Offspring
Elders
leaves and stems of grasses and other herbaceous vegetation
Bro
nipping grass and leaves
Taxons
almost no rain in summer, more precipitation in winter
if born as {name}
Foraging takes place among trees and woody vegetation.
age
birth date
no permanent shelter
rest
Fur color
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
The basics
bark and bast of trees and shrubs
climbing
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
teeth
after transformation until death
Potential Habitat
lots of grass, few trees, rains are rare
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
young shoots and leaves of plants
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
terrestrial
Plants
Gestation
land
{name} birthday
Food is gathered directly from leaf surfaces.
Nearctic realm
grass
No results found
North America and Greenland, from tundra to forests
On the map
young shoots, sprouts, green plant shoots
Pleasant summer
all life stages
Female ♀
Cold and almost dry
nest located directly on the ground surface on land
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
tree bark
Maturity
terrestrial habitat, land surface outside water
sq mm
yr
comfortable summer, +20…+25 °C
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?
Very dry
Neither
Moving up vertical surfaces like trunks or rocks to reach food.
from birth to adulthood
Young offspring still dependent on parental care.
caring mother
What do they eat?
dry and cold almost all year round
Where do they live?
Immature individual that has not yet reached reproductive maturity.
much snow in winter, cold
Ears color
Hard dental structures used to bite, tear, or scrape food.
berries
forests on land — tropical, temperate, boreal
Temperate mixed forest
6 to 47 kilograms, 0.9 – 2.5 meters
Duration
This is me
Warm summer with almost no rain
Steppe
Always very wet
Gamers
How are they built?
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
terrestrial
Taiga
Antlers 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?
Warm summer and lots of rain
inhabit and develop on land, outside water bodies
celebrated their {n} birthday
When you would have been born if you lived as {name}
Cold steppe
Daddies
Lifespan maximum
Hermaphrodite ⚥
North America and Greenland, from tundra to forests
embryo
Coat color
summer warm, many oaks, birches, maples
Length
kg
very hot and dry, rare rains, cacti live
lots of rain, warm and pleasant summer
arboreal
Observations
◉{N} more on tap