Given the chronology... I think that was my fault.
When I was about 10-11, I used to do a lot of random edits on Wikipedia (didn't quite "get" what it was for then) - and, as I recall, that was one of them (I'd found out about them from animal books and didn't know the abysmal survival rates at the time... I was 10, mind you).
It's kind of embarrassing admitting that I used to do this now - and I'd honestly forgotten what specific edits I did until I read it just now. (There is a drawing of an indri in the Madagascar section - is the picture of that?)