Hey, first post on here since 2009, but it's a doozy...
Here is a photo I captured of Super Mario Advance 2 on my GBA screen. It depicts, evidently, a White Yoshi. I can't remember what I did exactly to achieve it, but I was on a Red Yoshi in the 'Outrageous' course and got knocked off it. I went on to complete the level in that same session, but on the world map I was on a Yoshi again, this one was light blue in colour and when I moved sideways on the map, its head was missing.
I entered the 'Funky' level and this is what I saw...

I did a Google search and found absolutely no results for a White Yoshi in this game ?? So is this a weird glitch or have I stumbled across a major secret ?