Beautiful chart displays native speakers of world's languages

I was going to to remark on this: it’s interesting to me that of the ~6 billion from the survey, they’ve left out 1/3 of the folks. Obviously, there’s a limit to the number of languages they could include in a single graphic, but I think it also emphasizes the sheer diversity of languages out there.

Also, I’m not entirely sure how they dealt with people who have multiple native languages.