Here you’ll find 31 Big animals that start with B, organized from “Bactrian camel” to “Burmese python”. They include large mammals, birds, reptiles, and fish defined by typical adult mass or length. You can use this list for learning, teaching, quick reference, or creating wildlife content.

Big animals that start with B are large-bodied species whose common names begin with the letter B. Many played notable roles in culture and trade, such as the Bactrian camel on Silk Road caravans.

Below you’ll find the table with Common name, Scientific name, Primary habitat, and Typical wild lifespan (years).

Common name: The everyday species name; you use it to quickly recognize and search for animals.

Scientific name: The Latin name gives precise species identification and helps you find reliable scientific information.

Primary habitat: Lists biome and region so you know where each animal lives in the wild.

Typical wild lifespan (years): Shows average adult lifespan in the wild to guide comparisons and planning.

Big animals that start with B

Common nameScientific namePrimary habitat (biome + region)Typical adult size & typical wild lifespan
Blue whaleBalaenoptera musculusOceanic — WorldwideWeight: 120,000 kg; Length: 24.0 m; Lifespan: 80 yrs
Bowhead whaleBalaena mysticetusArctic sea ice — ArcticWeight: 75,000 kg; Length: 15.0 m; Lifespan: 100 yrs
Bryde’s whaleBalaenoptera brydeiCoastal tropical seas — Indo-PacificWeight: 20,000 kg; Length: 13.0 m; Lifespan: 50 yrs
Beluga whaleDelphinapterus leucasCoastal Arctic/subarctic seas — Arctic regionsWeight: 1,000 kg; Length: 4.0 m; Lifespan: 35 yrs
Bluefin tunaThunnus thynnusPelagic — North AtlanticWeight: 450 kg; Length: 3.0 m; Lifespan: 15 yrs
Blue sharkPrionace glaucaPelagic ocean — WorldwideWeight: 200 kg; Length: 3.5 m; Lifespan: 20 yrs
Basking sharkCetorhinus maximusTemperate coastal seas — WorldwideWeight: 5,000 kg; Length: 8.0 m; Lifespan: 50 yrs
Bull sharkCarcharhinus leucasCoastal rivers & estuaries — Tropics worldwideWeight: 230 kg; Length: 3.5 m; Lifespan: 16 yrs
Black marlinIstiompax indicaTropical open seas — Indo-PacificWeight: 700 kg; Length: 4.6 m; Lifespan: 20 yrs
Beluga sturgeonHuso husoLarge rivers & adjacent seas — Caspian/Black Sea basinsWeight: 1,200 kg; Length: 6.0 m; Lifespan: 60 yrs
Black caimanMelanosuchus nigerTropical freshwater — Amazon BasinWeight: 300 kg; Length: 4.0 m; Lifespan: 50 yrs
Boa constrictorBoa constrictorTropical forest & savanna — Central/South AmericaWeight: 30 kg; Length: 3.0 m; Lifespan: 20 yrs
Burmese pythonPython bivittatusTropical forest & grassland — Southeast AsiaWeight: 150 kg; Length: 5.5 m; Lifespan: 25 yrs
Black mambaDendroaspis polylepisSavanna/woodland — Sub-Saharan AfricaWeight: 2.0 kg; Length: 2.8 m; Lifespan: 11 yrs
BisonBison bisonGrassland/steppe — North AmericaWeight: 700 kg; Height: 1.8 m; Lifespan: 20 yrs
Bactrian camelCamelus ferusDesert/steppe — Central AsiaWeight: 600 kg; Height: 2.3 m; Lifespan: 40 yrs
BuffaloSyncerus cafferSavanna/woodland — Sub-Saharan AfricaWeight: 700 kg; Height: 1.7 m; Lifespan: 20 yrs
BonoboPan paniscusTropical rainforest — Congo BasinWeight: 45 kg; Height: 1.5 m; Lifespan: 40 yrs
BongoTragelaphus eurycerusMontane & lowland forest — Central/West AfricaWeight: 250 kg; Height: 1.2 m; Lifespan: 20 yrs
Blue wildebeestConnochaetes taurinusSavanna — East & Southern AfricaWeight: 170 kg; Height: 1.4 m; Lifespan: 20 yrs
Brown bearUrsus arctosForest/mountain — Northern HemisphereWeight: 300 kg; Height: 2.5 m; Lifespan: 25 yrs
Black bearUrsus americanusForest/woodland — North AmericaWeight: 90 kg; Length: 1.5 m; Lifespan: 20 yrs
Brown hyenaParahyaena brunneaArid scrub & coastal plains — Southern AfricaWeight: 40 kg; Height: 0.8 m; Lifespan: 12 yrs
Black rhinocerosDiceros bicornisSavanna & scrub — Sub-Saharan AfricaWeight: 1,000 kg; Height: 1.5 m; Lifespan: 35 yrs
Blue sheepPseudois nayaurAlpine grassland — Himalaya/Tibetan PlateauWeight: 50 kg; Height: 0.8 m; Lifespan: 15 yrs
Broadnose sevengill sharkNotorynchus cepedianusCoastal temperate seas — Southern Hemisphere & PacificWeight: 150 kg; Length: 3.0 m; Lifespan: 25 yrs
Bronze whalerCarcharhinus brachyurusCoastal warm seas — Southern HemisphereWeight: 120 kg; Length: 3.5 m; Lifespan: 20 yrs
Brazilian tapirTapirus terrestrisTropical forest & wetlands — Amazon Basin & South AmericaWeight: 250 kg; Length: 2.0 m; Lifespan: 25 yrs
Baird’s tapirTapirus bairdiiTropical forest & mountains — Central AmericaWeight: 250 kg; Length: 2.0 m; Lifespan: 30 yrs
BarasinghaRucervus duvauceliiFloodplain grassland & swamp — South AsiaWeight: 150 kg; Height: 1.2 m; Lifespan: 20 yrs
BlackbuckAntilope cervicapraGrassland & scrub — Indian subcontinentWeight: 35 kg; Height: 0.8 m; Lifespan: 15 yrs

Descriptions

Blue whale
The largest animal on Earth by mass and length; blue whales dominate oceans and can live many decades.
Bowhead whale
A massive Arctic baleen whale known for extreme longevity and thick blubber, adapted to ice-edge waters.
Bryde’s whale
A medium-large baleen whale of warm waters, often seen near coasts and known for feeding on schooling fish.
Beluga whale
Recognizable white whale of Arctic waters, social and vocal; large compared with most dolphins.
Bluefin tuna
A powerful, fast-bodied tuna prized by fisheries; reaches large sizes and migrates long distances.
Blue shark
Slender, deep-ocean shark with long migrations; reaches lengths over 3 m, making it a large pelagic shark.
Basking shark
Gentle plankton-feeder and the second-largest fish; notable for its huge gaping mouth and slow cruising.
Bull shark
Robust coastal shark famous for tolerance of freshwater; powerful build and reaches several meters long.
Black marlin
A very large billfish prized by sport fishers; long, muscular body and heavy mass.
Beluga sturgeon
One of the world’s largest freshwater fishes, historically produced huge caviar-bearing females.
Black caiman
A large crocodilian of Amazonia; dark coloration and heavy body make it a top aquatic predator.
Boa constrictor
Large constricting snake often exceeding 2–3 m; heavy-bodied and powerful predator.
Burmese python
One of the world’s largest snakes by length and mass, capable of swallowing large prey.
Black mamba
Very long and fast venomous snake; length makes it a large serpent despite modest mass.
Bison
Iconic North American grazer with massive head and hump; bulls can weigh many hundreds of kilograms.
Bactrian camel
Two-humped camel of Asian deserts and steppes; large-bodied and adapted to extreme climates.
Buffalo
Robust African buffalo is a heavy, herd-living bovine and an important ecological grazer.
Bonobo
Close relative of chimpanzees; large-bodied ape with complex social behavior and notable size among primates.
Bongo
A striking, large forest antelope with bold stripes; heavy-bodied compared with many antelopes.
Blue wildebeest
Common savanna grazer famous for mass migrations; stocky body and horns make it clearly large.
Brown bear
Widespread large bear species; omnivorous and capable of great size in coastal populations.
Black bear
North America’s most common bear; smaller than brown bear but still a large mammal.
Brown hyena
A robust scavenger; larger and hairier than many small carnivores and notable in open habitats.
Black rhinoceros
Thick-skinned, heavy-bodied browser with two horns; one of Africa’s largest terrestrial mammals.
Blue sheep
Mountain ungulate commonly called bharal; compact but heavy for its habitat, living at high elevations.
Broadnose sevengill shark
A large, primitive shark with multiple gill slits; coastal predator reaching about three meters.
Bronze whaler
Also called copper shark, a sizable coastal requiem shark common off temperate coasts.
Brazilian tapir
Large browsing mammal with a short proboscis; important seed disperser in Neotropical forests.
Baird’s tapir
The largest land mammal in Central America; sturdy body and important for forest ecology.
Barasingha
Also called swamp deer, a relatively large cervid adapted to marshy plains.
Blackbuck
Slender antelope with long horns; lighter than some ungulates but over the 20 kg threshold so considered big.
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