What is the most common type of mammal in the world?

The most common type of mammal in the world is the rodent. There are over 2,200 species of rodents that can be found all over the globe, except for Antarctica. Rodents make up about 40% of all mammal species on earth, and are found in almost every habitat, including forests, deserts, grasslands, and even cities.

Some of the most well-known types of rodents include mice, rats, squirrels, hamsters, and beavers. Despite their small size, rodents play an important role in the ecosystem as they are food for many predators and help to disperse seeds and nutrients throughout their habitats.