Version of Minecraft, version of Animania, Single Player or Server

Minecraft 1.12.2
Minecraft Forge Server 14.23.1.2608
Animania 1.4.6

Mods:
appliedenergistics2-rv5-stable-9.jar
ChinjufuMod[1.12.2]3.1.4.1.jar
CoFHCore-1.12.2-4.3.10.5-universal.jar
deepresonance-1.12-1.6.0.jar
ElecCore-1.12.2-1.8.434.jar
Futurepack+Colorization+Addon-1.0.1.jar
Futurepack-1.12.2-26.3.123.jar
mcjtylib-1.12-2.6.4.jar
Mekanism-1.12.2-9.4.3.330.jar
MekanismGenerators-1.12.2-9.4.3.330.jar
MekanismTools-1.12.2-9.4.3.330.jar
millenaire-6.2.0-beta.9.jar
RedstoneFlux-1.12-2.0.1.2-universal.jar
ThermalDynamics-1.12.2-2.3.10.4-universal.jar
ThermalExpansion-1.12.2-5.3.10.15-universal.jar
ThermalFoundation-1.12.2-2.3.10.6-universal.jar
animania-1.12.2-1.4.6.jar
AppleCore-mc1.12.2-3.1.0.jar
AppleSkin-mc1.12-1.0.9.jar
Baubles-1.12-1.5.2.jar
BetterFps-1.4.8.jar
BetterWithMods-1.12-2.0.27.jar
BiomesOPlenty-1.12.2-7.0.1.2330-universal.jar
Born+In+A+Barn+V1.8-1.12-1.0.jar
Chameleon-1.12-4.1.3.jar
[ClayWorldGen-1.1.0-1.12.0.jar
CodeChickenLib-1.12.2-3.1.5.331-universal.jar
CoFHWorld-1.12.2-1.1.1.12-universal.jar
CoralReef-2.4-1.12.2.jar
CraftingTweaks_1.12.1-8.1.6.jar
CraftStudio-1.0.0.93-mc1.12-alpha.jar
CraftTweaker2-1.12-4.1.5.jar
CreativeCore+v1.9.17+mc1.12.2.jar
CustomMobSpawner-3.11.3.jar
DrZharks MoCreatures Mod-12.0.3.jar
Ferdinand's+Flowers-1.9.3-1.12.jar
GardenStuff-1.12-2.1.1.jar
gigaherz.commons-1.12.1-0.6.4.jar
Hwyla-1.8.23-B38_1.12.jar
instantunify-1.12.2-1.1.1.jar
jei_1.12.2-4.8.5.159.jar
jeiintegration_1.12.2-1.5.1.36.jar
JustEnoughResources-1.12.2-0.8.7.41.jar
LootTableTweaker-1.12.2-1.1.13.jar
lostcities-1.12-2.0.5.jar
lostsouls-1.12-1.1.4.jar
Mantle-1.12-1.3.1.21.jar
minecolonies-universal-1.12.2-0.8.7582.jar
modtweaker-4.0.7.jar
MTLib-3.0.3.jar
natura-1.12.2-4.3.2.42.jar
naturalnetherportals-1.2.0-mc1.12.x.jar
NoMoreRecipeConflict-0.9(1.12).jar
NotEnoughIDs-1.5.4.2.jar
NotEnoughItems-1.12.2-2.4.1.233-universal.jar
paintedbiomes-1.12.2-0.5.4.jar
Placebo-1.12.2-1.3.1.jar
Plants-1.12.2-2.6.3.jar
PrimalCore-1.12.2-0.6.39.jar
RealisticTorches-1.12.2-2.1.1.jar
RebornCore-1.12.2-3.6.5.197-universal.jar
shetiphiancore-1.12.0-3.5.6.jar
Survivalist-1.12.2-2.1.4.jar
TConstruct-1.12.2-2.9.1.65.jar
TerraCore-1.12-2.1.8.jar
terraqueous-1.12.0-1.4.10.jar
Tinkers'+Addons-1.12.1-1.0.7.jar
UniDict-1.12.2-2.4.jar
WailaHarvestability-mc1.12-1.1.12.jar
WanionLib-1.12.2-1.5.jar
Wawla-1.12.2-2.5.251.jar
WrapUp-1.12-1.1.3.jar

Screenshots encouraged

Config option: "# Allow Animania Chickens to drop Feathers B:chickensDropFeathers=false" don't take effect.

The problem might be with another mod in your list. I'm not going to check them all.

This definately doesn't happen with just animania.

Yes. It's not this mod... W/o Animania chickens drop feathers too. Sorry.

Good to hear. Might want to check Terraqueous....