The mountain lion (Puma concolor) is the second largest cat in the Americas after the jaguar. While it's a big animal, the mountain lion is actually the largest small cat. It's more closely related to the domestic cat than to the lion or tiger. Puma concolor holds the Guinness World Record for the animal with the most common names. It is known as the mountain lion, cougar, puma, catamount, and about 40 other names in English. In keeping with its Linnaean name, scientists call the cat a puma (thoughtco.com).