Elder Roostros are the result of Roostros degrading to an elder state.
Roostros have a low chance of turning elder after producing a chick with a hen, and can no longer reproduce in this state.
Elder roostros are the senior-aged roostros who have retired from the otherwise bustling life of their younger counteparts. 'Young roostros crow too much, they move too fast, and frankly have no respect for their elders,' an elder roostro might say of youths; as they make a gross, smacking sound with their lips. Though this is of course impossible, as roostros do not have lips.
On the Ranch:
An elder roostro can no longer sire chickadoos and serves no other purpose than becoming a slightly tough chicken dinner.
- An Elder Roostro can be used to get the carousel achievement.
- Elder Roostros can still be fed to meat-eating Slimes, though no Slime favours them.