That depends on what you call an animal.
Short Answer: Microtus pennsylvanicus
The common field mouse (Meadow Vole) is the most common mammal in North America.
Long Answer:
I don't know how it would be possible to count them all -however I do think it could be the US's most common wild animal.
I wouldn't say most 'popular' I'd say most common. If there were to be a most common animal, it would be cats.
During the age of pioneers in the US, the most common wild animal seen was the water buffalo. There were so many that the pioneers shot them down in a train to clear the train tracks.
American Eagle
In North America, a wild reindeer is called a caribou.
The most common field for a veterinarian in the US is small animal or companion animal medicine exclusive, focusing on treating cats and dogs.
tigers
In the west the most common cause of wild fires are people, another common reson is lighting
Microtus pennsylvanicusThe common field mouse (Meadow Vole) is the most common mammal in North America.
Cattle,Swine,Poultry.
a wild hog
One can find a wild animal baby toy at various retailers. One can find a wild animal baby toy at retail stores such as Target, Walmart, and Toys"R"Us.