10.) Big, ferocious lions (from the rear)
9.) Large, vicious birds (from the front)
8.) The wrong mythical animal (particullarly flions, rocs and "common" chimera)
7.) Mirages, illusions, and drunken hallucinations
6.) Gargoyles and other stone statues
5.) Coat racks
4.) Cloud formations (especially in L.A.)
3.) Enemy aircraft
2.) Alien space craft (they are often classified as "UFO")

And the Number One Thing Griffins are Mistaken For:

1.) Rampant Imaginations