Check out Vine DeLoria's "Red Earth, White Lies". The 70,000,000 year thing turns out to be a fairytale.
Nope. No spiky tail here. Tail looks kinda puny too.
BTW, The end that bites is much easier to restrain that the end that will repeatedly slap the living crap out of you...
(Do you think early European map makers put "here be dragons" in the unexplored areas because there actually were dragons there?)