Hey, I would like to point out that your source appears to be incorrect. It is citing the total number of reptile species, not the total number of snakes.
It has the same numbers but for total reptiles, and it gives you number of snake species. I would redo this quiz with these numbers. If you still wanted to have a couple of harder ones, you could increase it to 22 countries.
Check out this link: Snake Population by Country.
It has the same numbers but for total reptiles, and it gives you number of snake species. I would redo this quiz with these numbers. If you still wanted to have a couple of harder ones, you could increase it to 22 countries.