If Yoshi's had opposable thumbs they'd be able to throw that bastard mario off their backs. Since they don't, they are forever condemned as mario's favored beast of burden, or in more common terms, his

.
I can't imagine any creature, real or fictional, wanting an overweight midget plumber jumping on their unsuspecting backs. I could be wrong though (shakes thoughts of bizare midget fetish from mind...)
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Thats why I'm armed with a sniper rifle. I'll take our mario before he can even think of parking his ass on my back.