Feather is an item in Chrono Trigger and Chrono Cross.
This item is found by defeating enemies in the Prehistoric Age (65,000,000 B.C.). It can be traded for several different equipment items in Ioka Village Hut.
The following monsters drop feathers:
Can be traded for (Before Magus is defeated):
Can be traded for (After Magus is defeated):
Can be traded for (After saving Crono):