Brown bear

Mexican grizzly bear β€” Β© Zveriki.com, AI-generated image based on the original work of, Creative Commons Attribution-Share Alike 4.0 International
Mass
148706–150597 g
Length
1400–2800 mm
Lifespan
7305–10958 days 20–30 years
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mexican-grizzly-bear
en
mexican grizzly bear
Ursus arctos
126
The brown bear, or grizzly, is a large strong mammal. It lives in forests and mountains, swims well and can run very fast.
The brown bear stands out for its great strength, long claws, and ability to hibernate in a den. It is important for nature because it spreads plant seeds and helps maintain balance between different animal species.
collects plants, catches fish with paws and sometimes hunts
trophic:omnivore
feeding_sense:olfaction
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Mass (bear cub)
500–50000 g
Mass (adult bear, male)
135000–400000 g
Mass (embryo)
1–500 g
Mass (adult bear, female)
95000–250000 g
Length (embryo)
55–145 mm
Length (adult bear, male)
1800–2800 mm
Length (adult bear, female)
1400–2100 mm
Length (bear cub)
200–1200 mm
Height
1500–3500 mm
Lifespan maximum
14610 days 40 years
Theoretical lifespan
7305–13561 days 20–37 years
Gestation
103 days 3 months 2 weeks
Litter size
1–4
Maturity
1460–2920 days 4–8 years
Offspring
1–4
Repro interval
730–1460 days 2–4 years
Teeth count (adult bear)
42
Claws count (bear cub)
20
Claws count (adult bear)
20
Claws size (adult bear)
50–100 mm
Claws size (bear cub)
10–30 mm
Reproduction
normal sexual
Comparable in mass
Sofa
Biome
Montane grasslands
Biome
Temperate steppe
Biome
Taiga
Biome
Temperate mixed forest
Biome
Tundra
Biome
Flooded grasslands
Realm
Palearctic realm
Realm
Nearctic realm
Biome
Temperate coniferous forest
Climate
Cool summer and lots of rain
Climate
Warm summer and lots of rain
Landscape
terrestrial
Landscape
alpine and arctic tundra
Landscape
terrestrial forest
Climate
Always very wet
Landscape
terrestrial herbaceous
Climate
Hot steppe
Climate
Cold and almost dry
Climate
Cool summer
Climate
Very cold winter and hot summer
Climate
Winter with snow
Climate
Lots of rain and cool summer
Climate
Tundra
Climate
Warm summer
Climate
Warm summer with almost no rain
Food environment
arboreal
Food environment
terrestrial
Food environment
aquatic
Shelter
den
Trophic type
omnivore
Reproduction
caring mother
Reproduction
in a burrow
Reproduction
nest on the ground
Reproduction
live birth
Reproduction
in a terrestrial nest
Reproduction
land
Physiology
The bear molts in spring when it changes its thick winter fur to lighter summer fur.
7305.0
10957.5
7305.0
13561.257553038356
1400.0
2800.0
148705.93648399107
150596.75841580125
The bear molts in spring when it changes its thick winter fur to lighter summer fur.
-1
-1
meadows, prairies, forb glades on land
homogamy, reproduction always with fertilization, no alternation of generations
Worker
Were {name} like {animal}, then:
birth time
Describes the act of excavating soil or substrate to locate or access food.
ambush
breeding
pursuit
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 Β°C
t
When your next jubilee falls in {name} life years
Human
very cold, short summer, almost no trees, lots of moss
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 β€” real recorded lifespans are often significantly shorter.
adult bear
Maturity
insects
About health
milk
cool, lots of coniferous trees, snow in winter
Searches for food on or among rocks and stony surfaces.
anything
When your next birthday would fall if you lived as {name}
carrion
Sofa
Repro interval
results
summer warm and almost no rain
summer warm, winter not very cold
Colors
Cool summer
Sex
Upcoming jubilees
scavenging, eat already dead animals
Gremllins
mo
live fish
alpine meadows and arctic tundra on land
Trophic type
Filters
summer very hot, dry, lots of grass
Palearctic realm
den
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
high in the mountains, cold, lots of grass and shrubs
in a burrow
Height
nest on the ground
rains almost always, very humid
young are born live on land, not hatched from eggs or roe
Age (juvenile)
Age (from birth to death)
rock
Age (embryo)
most of Europe and Asia, various forests, steppes and tundra
Wanderers
Jubilee = every 10th birthday
Fruit
berries
More:
Tundra
Earliest developmental stage inside an egg or womb.
Business sausages
Very cold winter and hot summer
roots
ice
Lifespan average
nest located directly on the ground surface on land, only the mother provides parental care for the offspring
in a terrestrial nest
Regeneration
Montane grasslands
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
small mammals
metamorphosis / end of larval stage
fish
end of acceleration
Share
Find a pet...
Mature, fully developed individual capable of reproduction.
nest hidden in an underground burrow
very cold winter and very hot summer
Actively hunting and capturing live prey.
digging
Pets
Primary oral structure used to seize, manipulate, or ingest food.
Nearctic realm
juicy berries β€” bilberry, rowan, rosehip
Lots of rain and cool summer
Hot steppe
Feeding occurs primarily on land or in vegetation.
{name} jubilee
paw
Claws count
cm
Temperate coniferous forest
Old-timers
Find an animal or breed...
mouth
collects plants, catches fish with paws and sometimes hunts
Claws size
turns
Rascals
terrestrial forest
terrestrial herbaceous
olfaction
Flooded grasslands
drink mother's milk in childhood
Litter size
Map data sources: Ecosystem classification β€” 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 β€” NOAA LME Program; Bathymetry β€” GEBCO Bathymetric Compilation Group (2026), GEBCO_2026 Grid, https://doi.org/10.5285/4f68d5c7-45eb-f999-e063-7086abc036fa; Climate data β€” Generated using Copernicus Climate Change Service information; Species occurrence data β€” GBIF.org, Derived dataset "all animals", https://zveriki.com/dataset/dataset.tsv; Terrestrial ecoregions β€” 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
Β°C
Not specified
Share
alpine and arctic tundra
Actively searching habitats to locate food items.
Where are they found?
steppe
Describes food handling or digging performed with the forelimbs.
lots of rain, cool summer, snow in winter
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
Offspring
Elders
Bro
normal sexual
Taxons
if born as {name}
Foraging takes place among trees and woody vegetation.
cold, short summer, almost no trees
omnivore
Actively chases and captures mobile prey in open space.
age
Predator remains still and concealed before launching a sudden attack.
birth date
small mammals β€” mice, shrews, bats
swimming
Palearctic realm
rest
Fur color
Close
was
Career from 7 to 15 months. Dwarf hamsters, voles, field crickets celebrate their birthday twice a month
The basics
climbing
hibernation
My weight?
Non-stop carnival: they only live a few days. Mayflies, rotifers, midges celebrate their birthday more than twice a day
Insects
primary food sources
arid steppe
after transformation until death
Potential Habitat
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.
lots of rain, summer not hot
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
terrestrial
Gestation
aquatic
small mammals
land
{name} birthday
Nearctic realm
grass
Link copied
No results found
North America and Greenland, from tundra to forests
branches
omnivory, they eat plants, animals, and mushrooms β€” almost any food
On the map
all life stages
Female ♀
Cold and almost dry
nest located directly on the ground surface on land
150 to 300 kilograms, 1.6 – 4 meters
Map data sources: Ecosystem classification β€” 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 β€” NOAA LME Program; Bathymetry β€” GEBCO Bathymetric Compilation Group (2026), GEBCO_2026 Grid, https://doi.org/10.5285/4f68d5c7-45eb-f999-e063-7086abc036fa; Climate data β€” Generated using Copernicus Climate Change Service information; Species occurrence data β€” GBIF.org, Derived dataset "all animals", https://zveriki.com/dataset/dataset.tsv; Terrestrial ecoregions β€” RESOLVE Ecoregions 2017 (Dinerstein et al., 2017), CC BY 4.0 Potential habitat modelled from GBIF occurrence data. Map Β© Zveriki.com, licensed under CC BY 4.0.
birth year
lots of grass, few trees, rains occur
Shelter used specifically for reproduction or nesting.
Maturity
terrestrial habitat, land surface outside water
sq mm
yr
nuts
How similar?
Fish
Honey
Male β™‚
until the celebration
bear cub
Tundra
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
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
berries
forests on land β€” tropical, temperate, boreal
water often floods the land, lots of grass
Temperate mixed forest
Duration
live insects
fish
This is me
Warm summer with almost no rain
most of Europe and Asia, various forests, steppes and tundra
Always very wet
Gamers
Teeth count
How are they built?
Cool summer and lots of rain
Temperate steppe
mm
Theoretical lifespan
ml
Stars
Link copied
My age?
wk
My size?
terrestrial
Taiga
Asexual
swap
roots and plant tubers
active predation
nuts
Who among us will transform as if by magic and become like {animal}?
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?
Denotes a grassland or steppe habitat preference.
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}
Daddies
Lifespan maximum
foraging
Hermaphrodite βš₯
North America and Greenland, from tundra to forests
embryo
Shoulder muscles color
summer warm, many oaks, birches, maples
Length
kg
lots of rain, warm and pleasant summer
arboreal
Observations
hard nuts β€” acorns, hazelnuts, pine nuts
β—‰{N} more on tap
bear cub
pupa
imago
adolescent
adolescent
mexican-grizzly-bear
buryj-medved
qonur-ayi
db-bny
bury-myadzvedz
gors-arj
higuma
mura-datvi
buryj-medved
bulgom
ayuu
mrki-medved
sory-ayu
qo-ng-ir-ayiq
zong-xiong
  • The Mexican grizzly bear is capable of breaking the spine of a bull, bison, or bison with a single paw strike.
  • Despite its clumsy appearance, the Mexican grizzly bear can run at speeds up to 50 km/h. It is also a good swimmer and climbs trees well in its youth.
  • During the 10–30 day mating season from May to July, male brown bears begin to roar loudly and fight each other for a female. The winner sometimes eats the defeated one.
  • The largest brown bear caught on Kodiak Island for the Berlin Zoo weighed 1134 kg. This is the highest recorded weight among known individuals of this species.
  • The smallest brown bears live in Europe, while the largest live in Alaska and Kamchatka, where they weigh 500 kg or more.
  • Brown bears living on Kamchatka feed exclusively on capelin and salmon in the fall, and continue to eat only fish in the winter.
  • The lifespan of the Mexican grizzly bear in the wild is 20–30 years, and in captivity it can reach up to 47–50 years.
  • The Mexican grizzly bear accumulates up to 180 kg of subcutaneous fat by winter and enters its den in autumn. Dens are usually located on dry ground, under the protection of fallen trees or uprooted tree roots.
  • During hibernation, the Mexican grizzly bear loses up to 80 kg of fat. Contrary to common belief, its winter sleep is not deep, and its body temperature fluctuates between 29 and 34 degrees.
  • Females give birth during hibernation.
  • The largest brown bear caught on Kodiak Island for the Berlin Zoo weighed 1134 kg. This is the highest recorded weight among known individuals of this species.

Age

  • The lifespan of the Mexican grizzly bear in the wild is 20–30 years, and in captivity it can reach up to 47–50 years.
  • Females give birth during hibernation.

Phenotype

  • The Mexican grizzly bear is capable of breaking the spine of a bull, bison, or bison with a single paw strike.

Shelter

  • The Mexican grizzly bear accumulates up to 180 kg of subcutaneous fat by winter and enters its den in autumn. Dens are usually located on dry ground, under the protection of fallen trees or uprooted tree roots.
  • During hibernation, the Mexican grizzly bear loses up to 80 kg of fat. Contrary to common belief, its winter sleep is not deep, and its body temperature fluctuates between 29 and 34 degrees.

Geography

  • The smallest brown bears live in Europe, while the largest live in Alaska and Kamchatka, where they weigh 500 kg or more.

Feeding

  • Brown bears living on Kamchatka feed exclusively on capelin and salmon in the fall, and continue to eat only fish in the winter.

Reproduction

  • Females give birth during hibernation.
  • Despite its clumsy appearance, the Mexican grizzly bear can run at speeds up to 50 km/h. It is also a good swimmer and climbs trees well in its youth.
  • During the 10–30 day mating season from May to July, male brown bears begin to roar loudly and fight each other for a female. The winner sometimes eats the defeated one.
  • During hibernation, the Mexican grizzly bear loses up to 80 kg of fat. Contrary to common belief, its winter sleep is not deep, and its body temperature fluctuates between 29 and 34 degrees.

In Husbandry

  • The Mexican grizzly bear accumulates up to 180 kg of subcutaneous fat by winter and enters its den in autumn. Dens are usually located on dry ground, under the protection of fallen trees or uprooted tree roots.