Rainbow alphabet doggerel (U,V)

U is for UnicornI once saw a unicornQuite unexpectedly.It stood upon a mountain sideUnder a eucalyptus tree.Unable to contain myselfI uttered words of joy,Aware of the enchantmentThat I was once more a little boy.The unicorn looked at meAnd seemed to understand.The dream was unforgettable,A utopian wonderland.___V is for VisionThe vulgar vultureWas very vainUntil he viewedHis reflectionIn a