Starting in Asia, we have stamps from Japan, Korea (?), Laos, and Singapore. It's not at all surprising that the Japanese stamp depicts the ultra-cute momonga, or Japanese dwarf flying squirrel. I'm honestly not sure about the second stamp, but I am guessing South Korea. Maybe some reader will confirm or correct me on this. Singapore's entry shows the cream-colored giant squirrel, which, sadly, can no longer be seen in Singapore.
The next group is from Europe. Not surprisingly, most of them show Eurasian red squirrels, the most common variety on the continent. Finland, however, has on its stamp a flying squirrel.
And, finally, I am not sure which country this stamp, featuring a flying squirrel, is from. I'm guessing maybe Estonia, but again maybe someone will help me out here.
Of course, I have only scratched the surface. There are many more squirrel postage stamps, and maybe soon I will feature more. And hopefully one day the countries of the world will do more to help their wildlife, beyond honoring them on postage stamps.