Here is the snake with his tongue and belly done. Below he has become a silver snake.  I don't know of any with this coloring in the wild but I have a vivid imagination of the family snake in the story of Helen of Troy. She goes to a temple to pray to a spirit in snakes for her health. She spends the night on the floor in the company of the real snakes. One crawls over her and sticks its tongue in her ear. From this she acquires her ability to see into the future. When she arrives back home she finds a baby snake had hidden in the chariot. She makes a shrine for it and keeps it with her, even when she flees to Troy with Paris.