Gallows bat
Hangs from the frames all day like everything else on the road, and is the only one that wakes.
A pet. It is kept on your profile rather than in your bag, so it cannot be sold, banked or lost, and it can be found again. Every find is told in the world's chat.
What drops it
The Lych-warden
1 in 3,000
Rolled on its own on every kill, rather than from the loot table, so it takes nothing away from anything else that falls off it.
Every number on these pages is read from the same rows the game runs on, so it cannot drift out of date. Drop chances are exact.