add white rat, replace sounds

chicken.lua

@@ -20,7 +20,10 @@ mobs:register_mob("mobs_animal:chicken", {
 	},
 	child_texture = {{"mobs_chick.png"}},
 	makes_footstep_sound = true,
-	sounds = {random = "mobs_chicken"},
+	sounds = {
+		random = "mobs_chicken",
+		replace = "default_dig_crumbly"
+	},
 	walk_velocity = 1,
 	run_velocity = 3,
 	runaway = true,

cow.lua

@@ -21,7 +21,10 @@ mobs:register_mob("mobs_animal:cow", {
 		{"mobs_cow2.png"}
 	},
 	makes_footstep_sound = true,
-	sounds = {random = "mobs_cow"},
+	sounds = {
+		random = "mobs_cow",
+		replace = "default_dig_crumbly"
+	},
 	walk_velocity = 1,
 	run_velocity = 2,
 	jump = true,

rat.lua

@@ -15,7 +15,8 @@ mobs:register_mob("mobs_animal:rat", {
 	mesh = "mobs_rat.b3d",
 	textures = {
 		{"mobs_rat.png"},
-		{"mobs_rat2.png"}
+		{"mobs_rat2.png"},
+		{"mobs_rat3.png"}
 	},
 	makes_footstep_sound = false,
 	sounds = {random = "mobs_rat"},

sheep.lua

@@ -90,7 +90,10 @@ for _, col in ipairs(all_colours) do
 		},
 		gotten_texture = {"mobs_sheep_base.png^mobs_sheep_shaved.png"},
 		makes_footstep_sound = true,
-		sounds = {random = "mobs_sheep"},
+		sounds = {
+			random = "mobs_sheep",
+			replace = "default_dig_crumbly"
+		},
 		walk_velocity = 1,
 		run_velocity = 2,
 		runaway = true,