Bat species account for 20% of all mammals.
The mouse is the most common mammal in the United States.
Humans of course! Humans are probably the most common mammal in the world.
Microtus pennsylvanicusThe common field mouse (Meadow Vole) is the most common mammal in North America.
humans
Dogs and cats are the most common mammal pets.
I would guess rats are the most common mammal in the world.
I would dare to say the most common mammal would be the brown rat (Rattus norvegicus), and not only in Mexico but also in the world.
Most, if not all, mammals can be infected with rabies. Worldwide the most common carrier is dogs. In the US the animal most likely to infect humans is bats. Raccoons and skunks are also common carriers.
I would guess rats are the most common mammal in the world.
It is hare or rabbit
The Cuban Hutia is the largest and possibly most common native mammal. It is a rat -like animal that lives in trees and grows to about 2 feet long.
Carnivores are the second most common order of mammals, ungulates being the first.
Various dolphins and whales are very common in Fijian waters. It has not been established which is most common.
Some people would say humans, but there are only about six billion of us. I would suggest that it would be either an animal that is useful to us (ie. sheep, cattle) or a rodent. My best guess would be the rat or mouse.