They become incredibly obnoxious before the GODS. see #19 So the alien overlords hurled a rock at the earth, canceling the show.. 20million years later reptiles returned to ABC.. [ame]https://www.youtube.com/watch?v=9X0hMjs8GdQ
Tricerapalin lived in prehistoric Alaska, from which it bragged it could see Russia. No one was impressed because back then Alaska and Russia were joined.
If you read the books from Robert Monroe , he was given this info on the history of the earth. We humans are better at making this stuff called loosh so the other critters were killed off . Here is one link http://forums.astraldynamics.com/viewtopic.php?f=34&t=19168 there are many more if you search loosh . desert rat