Number of mammals in the world

Here is the number of mammals on Earth :

AnimalTypePopulationSource yearSource
MiceMammal1,7 x 10^112017Weborus estimation
Wild rabbitsMammal1,4 x 10^112017Weborus estimation
HamstersMammal52,500,000,0002017Weborus estimation
Brown ratsMammal9,780,511,0002008The Sun
HumansMammal7,523,470,0002017Worldometers
SquirrelsMammal5,897,500,0002017Weborus estimation
HaresMammal2,880,000,0002017Weborus estimation
Black ratsMammal1,015,670,0002014Newsweek
Domestic sheepsMammal1,100,000,0002017World Atlas
CowsMammal998,300,0002017Beef2live
Domestic goatsMammal860,000,0002017World Atlas
Domestic pigsMammal784,830,0002016Statista
Domestic rabbitsMammal769,050,0002014Jetpunk Data World
Domestic catsMammal625,000,0002017World Atlas
Domestic dogsMammal425,000,0002017World Atlas
Wild boarsMammal350,000,0002017Weborus estimation
HedgehogsMammal219,000,0002017Weborus estimation
Stray dogsMammal200,000,0002011WHO
Water buffaloesMammal172,000,0002011MJAS
Guinea pigsMammal105,000,0002017Weborus estimation
Feral catsMammal100,000,0002013Ecology Global Network
Lab animalsMammal100,000,0002017Weborus estimation
WeaselsMammal80,000,0002017Weborus estimation
PorcupinesMammal62,790,0002017Weborus estimation
HorsesMammal58,000,0002011FAOSTAT
DeersMammal46,710,0002000IUCN
DonkeyMammal40,000,0002011FAOSTAT
MarmotsMammal30,000,0002017Weborus estimation
SealsMammal26,139,0002008IUCN
DromedariesMammal14,560,0002005ICAR
CamelsMammal14,000,0002010Randome House Digital
DuikersMammal13,234,0002008IUCN
FerretsMammal12,500,0002017Weborus estimation
BeaversMammal12,000,0001988Nowak, Ronald M
MulesMammal10,000,0002011FAOSTAT
ElksMammal10,030,0002009Gohunt
CoypusMammal10,000,0002017Weborus estimation
ChinchillasMammal7,000,0002017Weborus estimation
KangaroosMammal5,304,0402008IUCN
CapybarasMammal5,024,0002017Weborus estimation
ArmadillosMammal3,500,0002017Weborus estimation
CaribousMammal2,890,4102016IUCN
SpringboksMammal2,500,0002008IUCN
PolecatsMammal2,495,0002017Weborus estimation
ImpalasMammal2,000,0002008IUCN
Dik-diksMammal1,997,6002008IUCN
RaccoonsMammal1,600,0002017Weborus estimation
Blue wildebeestsMammal1,550,0002008IUCN
BatsMammal1,521,3002008IUCN
MoosesMammal1,500,0002008IUCN
GazellesMammal1,494,0002008IUCN
BushbucksMammal1,340,0002008IUCN
PangolinsMammal1,280,0002017Weborus estimation
Pilot whalesMammal1,158,0002006Taylor, B. L., Baird, R.
JackalsMammal1,000,0002017Weborus estimation
LamasMammal1,000,0002015IUCN
CoyotesMammal891,0002017Weborus estimation
African buffaloesMammal890,0002008IUCN
Elephant sealsMammal889,0002010IUCN
OribisMammal750,0002008IUCN
Plains zebrasMammal750,0002015IUCN
PronghornsMammal700,0002008IUCN
African leopardsMammal700,0002011IUCN
FoxesMammal672,1002001IUCN
Bottle-nosed dolphinsMammal600,0002006IUCN red list
SteenboksMammal600,0002008IUCN
KudusMammal600,0002008IUCN
Emperor pinguinsMammal595,0002012BBC News
GuanacosMammal589,7502008IUCN
ElephantsMammal550,0002016The Guardian
American bisonsMammal530,0002008IUCN
Minky whalesMammal515,0002012SCIWC
Sea lionsMammal503,9582008IUCN
MeerkatsMammal500,0002015Natural History
KoalasMammal500,0002012IUCN
AntelopesMammal492,0002008IUCN
GibbonsMammal406,5572008IUCN
GemsboksMammal373,0002008IUCN
SunisMammal365,0002008IUCN
HartebeestsMammal362,0002008IUCN
VicuñasMammal347,2732008IUCN
PlatypusMammal300,0002008IUCN
WombatMammal300,0002008Taggart and Robinson
Grey wolvesMammal300,0002008IUCN
ChimpanzeesMammal299,7002008IUCN
Water chevrotainsMammal278,0002008IUCN
MongoosesMammal219,0002017Weborus estimation
LechwesMammal212,0002008IUCN
ReedbucksMammal210,0002008IUCN
GorillasMammal206,6802008IUCN
Brown bearsMammal200,0002012IUCN
WaterbucksMammal200,0002008IUCN
GeladasMammal200,0002008IUCN
LemursMammal197,2442008IUCN
MartensMammal187,0002016V.G. Monakhov
SitatungasMammal170,0002008IUCN
BadgersMammal152,1002017Weborus estimation
HippopotamusMammal150,0002008IUCN
Fennec foxesMammal150,0002017Weborus estimation
OttersMammal142,6402008IUCN
Common elandsMammal136,0002008IUCN
Kangaroo ratsMammal134,0002004IUCN
PukusMammal130,0002008IUCN
MarmosetsMammal120,0002003IUCN
Fin whalesMammal119,0002008Reilly, S.B.; Bannister, J.L
Mountain goatsMammal119,0002008IUCN
Dall sheepsMammal116,5002008IUCN
BelugasMammal105,3482000IUCN
Bryde's whalesMammal100,0002016AUT
Japanese serowsMammal100,0002008IUCN
Polynesian ratsMammal100,0002011Amos W., Nichols H. J
GiraffesMammal97,5002016The Guardian
GerenuksMammal95,0002008IUCN
Sharpe's grysboksMammal95,0002008IUCN
IbexMammal90,0002008IUCN
HyaenasMammal77,0002013IUCN
OrangutansMammal76,3002008IUCN
East African oryxMammal67,0002008IUCN
BettongsMammal63,4002008IUCN
BlackbucksMammal50,0002008IUCN
Killer whalesMammal50,0002013IUCN Red List
BonobosMammal50,0002008IUCN
OkapisMammal50,0002013Hart
CougarsMammal50,0002008IUCN
Grizzly bearsMammal45,0752012Canadian ministry of forests
PeafowlsMammal45,0002005IUCN
ManateesMammal43,2962008IUCN
MacaquesMammal43,2692008IUCN
KlipspringersMammal42,0002008IUCN
LangursMammal37,3642008IUCN
LynxMammal37,3501994De Beaufort
NyalasMammal32,0002008IUCN
GaursMammal30,0002008IUCN
PumasMammal30,0002017Weborus estimation
BongosMammal28,0002008IUCN
Blue whalesMammal25,0002008IUCN
TamarinsMammal23,4002008IUCN
TapirsMammal22,5002017Weborus estimation
WarthogMammal22,2502016Swanepoel et al
Gray whalesMammal22,0002008IWC Office
White rhinocerosMammal20,1502011The Guardian
Giant elandsMammal20,0002008IUCN
Red-eared guenonsMammal20,0002008IUCN
LionsMammal20,0002015IUCN
SaigasMammal19,0202003IUCN
WoyliesMammal18,0002011IUCN
Leopard sealsMammal18,0002008IUCN
Black wildebeestsMammal18,0002008IUCN
Grey rheboksMammal18,0002008IUCN
TarucasMammal17,0002008IUCN
Right whalesMammal15,4232009Kenney, Robert D
JaguarsMammal15,0002011WWF
Wild yaksMammal15,0002008IUCN
Bohead whalesMammal14,5102008CDFO
Indian leopardsMammal14,0002014World Atlas
SurilisMammal13,0002008IUCN
AnteatersMammal11,2502017Weborus estimation
SifakasMammal10,4802008IUCN
Javan rusasMammal10,0002008IUCN
Red pandasMammal10,0002015IUCN
Kangaroo miceMammal10,0002008IUCN
Red goralsMammal10,0002008IUCN
Southern pudúsMammal10,0002008IUCN
Tasmanian devilsMammal10,0002007IUCN
African wild dogsMammal5,3002008IUCN
Black rhinocerosMammal4,8602011The Guardian
TigersMammal3,8902016John R. Platt
Indian rhinocerosMammal2,8502011The Guardian
Andean mountain catsMammal2,5002016IUCN
Grevy's zebrasMammal2,5002002IUCN
Darwin's foxesMammal2,4992004Jiménez and McMahon
Humpback whalesMammal2,1002014WWP
Great polar bearsMammal2,0502015IUCN
PandasMammal1,8642014WWF
Hartmann's mountain zebrasMammal1,3002008IUCN
Persian leopardsMammal1,2902017World Atlas
Proboscis monkeysMammal1,1002000IUCN
Indochinese leopardsMammal1,0002016World Atlas
European minksMammal6152000IUCN
Sloths Mammal6002017Weborus estimation
Black panthersMammal6002017Weborus estimation
Greater bamboo lemursMammal5002009Wright et al.
Cape mountain zebras Mammal5002008IUCN
BaijisMammal4001982Zhou
Sumatran rhinocerosMammal2752011The Guardian
Javan leopardsMammal2502017World Atlas
Amur leopardsMammal702017World Atlas
Arabian leopardsMammal502017World Atlas
Javan rhinocerosMammal442011The Guardian

Humans are without surprise the big mammal with the largest population.

The mice are far ahead of us with a 20 times greater presence on the globe. They have a sexual maturity at 8 weeks, a gestation time of 20 days. A mouse can give birth to 80 babies in its life.

The rabbits are also well positioned, with sexual maturity at 7 months and a gestation period of one month. A rabbit may have 48 kids during its life in the wild, and 144 if domesticated.

The rats are “only” a little less than ten billion. A female rat can give birth to 155 babies during its lifetime, which is much more than the mouse. Rats are found mostly in grasslands, contrary to what we might think. In town their population is quickly decimated in case of flood but their reproduction rate makes that they soon fill the gap.

Hamster is much more present than rats and mice, with up to 216 babies during the life of a female. Their pregnancy can reach up to 13 tiny hamster. That is why their population is colossal. They eat mostly seeds, but can also devour vegetables, fruits, stems, leaves, roots, insects, small vertebrates, frogs. Their food reserves can reach up to 200 lbs in some burrows. Sometimes they can devour each other to eliminate the weak ones.

There is a total of 396 billion of mammals on the planet.