Previously, snakes were a minor component of the North American fauna, but during the Miocene, the number of species and their prevalence increased dramatically with the first appearances of vipers and elapids in North America and the significant diversification of Colubridae ( including the origin of many modern genera such as " Nerodia ", " Lampopeltis ", " Pituophis " and " Pantherophis " ).
22.
Both " Bolla " and " Bullar " are actual names for snake / lizard species as well . " Bolla " ( usually stands for European ratsnake but different " bollas " include a group of serpents of families Colubridae or Boidae ) is considered as harmful as usually consumes eggs and poultry, while " Bullar " ( stands for common indigenous glass lizard Scheltopusik ) is considered harmless and even half-domestic as it consumes arthropods and mice.
