i know this is an old thread. i also know the question is about snakes but i had a snapping turtle, well actually hatched a snapping turtle. he would only let me hold him. and when i did he would ram his face into my hand (mouth closed of course). it really appeared that he was making sure it was me. when he confirmed it was me he would literally go limp and just relax.
i know what science tells us and i wont argue that but i do believe that sometimes there is something more. i mean some species of snakes care for their eggs and, dont quote me on this, but i think all crocadilians guard thier nests? i know its a propagation of the species instinct but i still think there is something going on that cant be explained by science.