Here are some examples:
* The United States: While there isn't a single "official mammal" for the entire country, the American bison is often considered a national symbol and has been designated as the "national mammal" by several states.
* Canada: The beaver is considered Canada's official national animal.
* Australia: The kangaroo is Australia's national animal, often considered to be a mammal due to its pouched young.
* India: The Bengal tiger is India's national animal, though it is a mammal.
If you're interested in learning more about a specific country's official mammal, you can search online for "national mammal [country name]".