Madame Uli Plonk was a Snowy Owl (Bubo scandiacus), and past singer at the Great Ga'Hoole Tree two centuries prior to the events of the main series. She is most famous for the song she wrote for the Owlipoppen Festival, the "Good Luck Song":
- "Luck be in my feathers, sorrows I untether,
- Luck be in my feathers for all that I will weather.
- Gather at the waters
- Owls of all the land,
- All my sons and daughters
- Let ill omens be banned.
- Come sing a joyful note
- To help improve our lot,
- Sorrows that yonder float
- Shall quickly be forgot.
- Let the owlipoppen drift
- Toward the light of dawn,
- In waters that run swift
- Our fortunes be redrawn.
- Luck be in my feathers, sorrows I untether,
- Luck be in my feathers for all that I will weather."
— Uli Plonk, A Guide Book to the Great Tree, pages 122-123