Rengidori - "れんぎどり（擂木鳥)"
•About this Yokai: A Tsukumogami (Haunted Antique) of an old Wooden Pestle, which has been freed from its Mortar! it Soars away with wings! [Most= commonly bird wings: but occasionally an insect or Bats!]
History: it commonly appears in Mid-Edo period board & card games. its full story seems to be lost to time but it seems to be based on a popular old saying: "擂木が鳥になる" or "A Pestle becomes a Bird." - In short: "The pestle has left the building" - Aside from that, I've read somewhere that they're made specifically made of camellia wood.
- See also: Furutsubaki No Rei