The Louse and the Flea
"The Louse and the Flea" or "Little Louse and Little Flea" is a German fairy tale collected by the Brothers Grimm, number 30.
It is Aarne-Thompson type 2022, An Animal Mourns the Death of a Spouse, and takes the form of a chain tale, sometimes known as a cumulative tale. Wilhelm Grimm probably heard the story from Dorothea Catharina Wild in 1808.