diff --git a/mods/ENTITIES/mobs_mc/chicken.lua b/mods/ENTITIES/mobs_mc/chicken.lua
index 38d3a38611..7b19511c53 100644
--- a/mods/ENTITIES/mobs_mc/chicken.lua
+++ b/mods/ENTITIES/mobs_mc/chicken.lua
@@ -11,9 +11,11 @@ mobs:register_mob("mobs_mc:chicken", {
 	type = "animal",
 	hp_min = 4,
 	hp_max = 4,
-	collisionbox = {-0.4, -0.01, -0.4, 0.4, 1, 0.4},
+	-- The x/z size is slightly bigger than in Minecraft (MC: 0.4×0.4; MCL2: 0.5×0.5)
+	collisionbox = {-0.25, -0.01, -0.25, 0.25, 0.69, 0.25},
 	
 	visual = "mesh",
+	visual_size = {x=0.7, y=0.7},
 	mesh = "mobs_mc_chicken.x",
 	textures = {
 	{"mobs_mc_chicken.png"}
diff --git a/mods/ENTITIES/mobs_mc/sheep.lua b/mods/ENTITIES/mobs_mc/sheep.lua
index 34d002c09e..abd4d4a66b 100644
--- a/mods/ENTITIES/mobs_mc/sheep.lua
+++ b/mods/ENTITIES/mobs_mc/sheep.lua
@@ -37,7 +37,8 @@ mobs:register_mob("mobs_mc:sheep", {
 	type = "animal",
 	hp_min = 8,
 	hp_max = 8,
-	collisionbox = {-0.45, -0.01, -0.45, 0.45, 1.29, 0.45},
+	-- FIXME: Should be 1.3 blocks high
+	collisionbox = {-0.45, -0.01, -0.45, 0.45, 1.09, 0.45},
 	
 	visual = "mesh",
 	visual_size = {x=0.6, y=0.6},