Humans Are the Most Numerous Mammals, With Rats Close Behind

Humans are the most numerous mammals at about 8 billion, followed by rats at about 7 billion; sheep, cows, goats, dogs, pigs and cats also number in the hundreds of millions or more.

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Humans are estimated to be the most numerous mammal on Earth, with the source article putting the human population at about 8 billion and the global rat population at roughly 7 billion. After those two come several animals closely tied to human life: about 1.18 billion sheep, 1 billion cows, 1 billion goats, 900 million dogs, 784 million pigs and roughly 700 million cats. The numbers are estimates rather than precise global headcounts, especially for animals such as rats and cats that are difficult to survey. The list is striking because almost every animal on it is domesticated livestock or a companion animal, with rats being the major exception. It highlights how strongly human societies have shaped mammal populations through farming, animal companionship and the environments we create. The source also notes that livestock populations can rise alongside demand for meat and dairy, while habitat loss and other pressures affect wild mammals. Population estimates can change as counting methods improve, so these figures are best understood as broad estimates rather than an exact census.

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