Discover the World's Most Abundant Mammal

Humans are currently the most numerous mammal species on Earth, with a population of 8 billion as of November 2022. However, among non-human mammals, the brown rat (Rattus norvegicus) is the most numerous due to its high reproductive rate. The house mouse also has a significant population, closely linked to human habitats. The global human population growth rate is slowing, with projections indicating it will take until 2037 to reach 9 billion.