Countries with the biggest cat populations

Name the world's most widely spoken languages.

Can you name the 52 countries of the world that have a smaller population than any country they share a land border with?

Can you name the 26 nations that have at least one urban area with 10,000,000 or more inhabitants? The '#' column is the number of megacities.

Name all the countries of the world that have a population of at least 200 million people.