Setting: any time in animal world.
Conflict: the group in animal world against the individual who don't have color.
Symbol: the leader symbolized evil feeling for human. The color what everyone have is personality.
Irony: firstly, one mouse victimized another mouse which didn't have color because of everyone had it except the mouse, however everyone started to notice it's wrong and one mouse was target next.
Climax: they made one mouse go out and they became happy and to cooperate each other including the mouse didn't have color.
Theme: personality is depends on each person, don't discriminate by difference.