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Most Common Mammals on Earth

Can you guess the 24 mammals with the largest population?
Green cells denote predominantly wild animals
Primary source: https://en.wikipedia.org/wiki/Lists_of_mammals_by_population
Secondary source: Various LLM estimates
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branlito
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Last updated: February 20, 2026
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First submittedOctober 1, 2021
Times taken140
Average score66.7%
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Total Population
Answer
12,000,000,000
Bat
8,300,000,000
Human
8,000,000,000
Rat
5,000,000,000
Mouse
1,500,000,000
Cattle
1,000,000,000
Pig
1,000,000,000
Sheep
900,000,000
Dog
900,000,000
Goat
710,000,000
Rabbit
600,000,000
Cat
280,000,000
Squirrel
200,000,000
Lemming
200,000,000
Water Buffalo
150,000,000
Mole
120,000,000
Weasel
100,000,000
Shrew
100,000,000
Possum
75,000,000
Deer
60,000,000
Hamster
58,000,000
Horse
45,000,000
Kangaroo
40,000,000
Fox
40,000,000
Camel
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