DS1 did that at about that age, or maybe a little closer to 2. I nearly died, though, because the first thing he did it with was an alphabet sticker book, while on a public bus. He did the entire darned sticker book faster than I could have. Trust me, we got looks.
I think it's wierd. I've tried to sound people out about it, and you're the first person who seems to have anything like a similar experience.
I have wondered if his ability to spot certain animals is connected (he is less fooled by camouflage than most), becasue that seems like a more evolutionarily-useful skill that isn't very different. And I wonder if this is somehow an expression of asynchrony or "thinking different" caused by an unusual developmental progression.
He's 3 now, and is not as strikingly good at this as he used to be. He's actually lost skill with it (although only very very slightly).
-Mich.
