Here is a story sketch by Vance Gerry, who boarded the sequence in which Kaa tries for the second time to hypnotize Mowgli. I believe young Floyd Norman also contributed story drawings for this section of The Jungle Book. There are plenty of terrific personality gags here. I love that Kaa's body can turn into specific but unexpected forms to interact with Mowgli. A swing, a staircase etc.
Frank Thomas animated the whole sequence, and he made sure that each scene has great entertainment value. He would call this character business.
