Livestock has a chance to give feathers.

src/base_system.nvgt

@@ -209,6 +209,7 @@ void attempt_livestock_production() {
 
     int meat_produced = 0;
     int skins_produced = 0;
+    int feathers_produced = 0;
 
     for (int i = 0; i < count; i++) {
         if (get_storage_count(ITEM_MEAT) < BASE_STORAGE_MAX) {
@@ -224,13 +225,21 @@ void attempt_livestock_production() {
                 skins_produced++;
             }
         }
+
+        if (get_storage_count(ITEM_FEATHERS) < BASE_STORAGE_MAX) {
+            if (random(1, 100) <= LIVESTOCK_FEATHER_CHANCE) {
+                add_storage_count(ITEM_FEATHERS, 1);
+                feathers_produced++;
+            }
+        }
     }
 
-    if ((meat_produced > 0 || skins_produced > 0) && x <= BASE_END) {
+    if ((meat_produced > 0 || skins_produced > 0 || feathers_produced > 0) && x <= BASE_END) {
         string msg = "Livestock produced ";
         string[] outputs;
         if (meat_produced > 0) outputs.insert_last(meat_produced + " meat");
         if (skins_produced > 0) outputs.insert_last(skins_produced + " skins");
+        if (feathers_produced > 0) outputs.insert_last(feathers_produced + " feathers");
 
         for (uint i = 0; i < outputs.length(); i++) {
             if (i > 0) {

src/constants.nvgt

@@ -148,6 +148,7 @@ const int HORSE_SUCCESS_BONUS_PER = 2;
 const int HORSE_DAMAGE_BONUS_STEP = 3;
 const int LIVESTOCK_MEAT_CHANCE = 6;
 const int LIVESTOCK_SKIN_CHANCE = 3;
+const int LIVESTOCK_FEATHER_CHANCE = 2;
 
 // Bandit settings
 const int BANDIT_HEALTH = 4;