In this page: http://commons.wikimedia.org/wiki/Commons:Featured_pictures/Animals/Fish?wit... there is an image called *Dactylopterus volitanshttp://commons.wikimedia.org/wiki/Dactylopterus_volitans * (Flying gurnard)
It sort of "doubles" if you put the cursor on it. All other images on the other hand just show their caption.
Aubrey