The illustrations are cute, but the story is lame.  It’s basically about a chameleon who’s all excited to see a sign declaring him “King of the Zoo,” until he tours the zoo, seeing the same sign on all the animals and throwing a temper tantrum over not being the best, until he’s all happy again when one little visitor declares him to be her favorite.  We never have an explanation for what the purpose is of the signs, and the chameleon never learns that it’s not a competition.  There doesn’t seem to be a point other than to provide an excuse to draw a cute chameleon shifting shapes/colors.