:BTW, that smaller snake definitely looks like Tantilla. What color is the belly of that snake?
Oh, it's not tantilla, it's got a cream colored belly, and the black on the head is fading. The larger sonorans I have all have dusky heads, like they had black heads as neonates. there was a debate some long time ago in this forum about whether it was Tantilla or Sonora, and finally the debate concluded that it was Sonora Semiannulata. Other than size and coloration they are absolutely identical, down to the size and placement of scales, facial scales, etc. And the "tantilla lookalike" does not have an orange belly.