Briar Chickadoos can be produced domestically in a coop by a Briar Hen if it is in the presence of a Roostro, and will itself grow up into a Briar Hen or - more rarely - a Roostro. Until it grows up, Slimes will not eat it.
Briar chickadoos are baby chickens that will eventually grow into a briar hen or more rarely, a roostro.
Chickadoos of all varieties will never be eaten by slimes. Some believe this is because slimes are too kind-hearted to do such a thing. Others believe it's because chickadoos don't yet have enough meat on their bones.
On the Ranch:
Keep Briar Chickadoos in a safe place and they'll eventually grow into a Briar Hen or Roostro.
- A chickadoo is required for the achievement "You... Monster!" in which you must throw a chickadoo into an Incinerator.