IMO this article leaves a bit to be desired about what the fruit flies actually did to prove they counted (I think they knew the container they were in was gonna shake) but, the article goes on to mention other species strange species that seem to have math ability - Including Salamanders and Newborn Chicks. Much to read at the link beyond this story too.
In the same manner that this is my `science' blog - this is my latest 2012 UFO Blog.
Bits of science and tons of interesting reading for AnomalyMan fans at this link - 10 Greatest Unsolved Mysteries. Underground genetics to old strange tales.
Check out these Amazon Books
Kwaidan: Ghost Stories and Strange Tales of Old Japan (Dover Books on Literature & Drama)
Black Hills Believables: Strange-but-true Tales of the Old West
And, please - if you have to leave and don't want to dig into the AnomalyMan Archive - See MY EIGHT Kindle Books All Priced Under 3.00