diff --git a/code/__DEFINES/is_helpers.dm b/code/__DEFINES/is_helpers.dm
index 8df9e3ae6c7..6a51b057434 100644
--- a/code/__DEFINES/is_helpers.dm
+++ b/code/__DEFINES/is_helpers.dm
@@ -125,6 +125,10 @@ GLOBAL_LIST_INIT(turfs_without_ground, typecacheof(list(
 
 #define ishostile(A) (istype(A, /mob/living/simple_animal/hostile))
 
+#define israt(A) (istype(A, /mob/living/simple_animal/hostile/rat))
+
+#define isregalrat(A) (istype(A, /mob/living/simple_animal/hostile/regalrat))
+
 #define isswarmer(A) (istype(A, /mob/living/simple_animal/hostile/swarmer))
 
 #define isguardian(A) (istype(A, /mob/living/simple_animal/hostile/guardian))
diff --git a/code/controllers/subsystem/minor_mapping.dm b/code/controllers/subsystem/minor_mapping.dm
index 30e06472fe3..eca7502c0ca 100644
--- a/code/controllers/subsystem/minor_mapping.dm
+++ b/code/controllers/subsystem/minor_mapping.dm
@@ -1,3 +1,5 @@
+#define PROB_MOUSE_SPAWN 98
+
 SUBSYSTEM_DEF(minor_mapping)
 	name = "Minor Mapping"
 	init_order = INIT_ORDER_MINOR_MAPPING
@@ -11,15 +13,18 @@ SUBSYSTEM_DEF(minor_mapping)
 /datum/controller/subsystem/minor_mapping/proc/trigger_migration(num_mice=10)
 	var/list/exposed_wires = find_exposed_wires()
 
-	var/mob/living/simple_animal/mouse/M
+	var/mob/living/simple_animal/M
 	var/turf/proposed_turf
 
 	while((num_mice > 0) && exposed_wires.len)
 		proposed_turf = pick_n_take(exposed_wires)
-		if(!M)
-			M = new(proposed_turf)
+		if(prob(PROB_MOUSE_SPAWN))
+			if(!M)
+				M = new(proposed_turf)
+			else
+				M.forceMove(proposed_turf)
 		else
-			M.forceMove(proposed_turf)
+			M = new /mob/living/simple_animal/hostile/regalrat/controlled(proposed_turf)
 		if(M.environment_air_is_safe())
 			num_mice -= 1
 			M = null
@@ -57,3 +62,5 @@ SUBSYSTEM_DEF(minor_mapping)
 				suitable += t
 
 	return shuffle(suitable)
+
+#undef PROB_MOUSE_SPAWN
diff --git a/code/modules/assembly/mousetrap.dm b/code/modules/assembly/mousetrap.dm
index a4febbaecaa..c05dbded620 100644
--- a/code/modules/assembly/mousetrap.dm
+++ b/code/modules/assembly/mousetrap.dm
@@ -62,6 +62,13 @@
 		var/mob/living/simple_animal/mouse/M = target
 		visible_message("<span class='boldannounce'>SPLAT!</span>")
 		M.splat()
+	else if(israt(target))
+		var/mob/living/simple_animal/hostile/rat/ratt = target
+		visible_message("<span class='boldannounce'>Clink!</span>")
+		ratt.apply_damage(5) //Not lethal, but just enought to make a mark.
+		ratt.Stun(1 SECONDS)
+	else if(isregalrat(target))
+		visible_message("<span class='boldannounce'>Skreeeee!</span>") //He's simply too large to be affected by a tiny mouse trap.
 	playsound(src, 'sound/effects/snap.ogg', 50, TRUE)
 	armed = FALSE
 	update_icon()
diff --git a/code/modules/mob/living/simple_animal/friendly/mouse.dm b/code/modules/mob/living/simple_animal/friendly/mouse.dm
index b2213d575df..476a911f09b 100644
--- a/code/modules/mob/living/simple_animal/friendly/mouse.dm
+++ b/code/modules/mob/living/simple_animal/friendly/mouse.dm
@@ -136,7 +136,7 @@
   *Spawns a new regal rat, says some good jazz, and if sentient, transfers the relivant mind.
   */
 /mob/living/simple_animal/mouse/proc/evolve()
-	var/mob/living/simple_animal/hostile/regalrat = new /mob/living/simple_animal/hostile/regalrat(loc)
+	var/mob/living/simple_animal/hostile/regalrat/regalrat = new /mob/living/simple_animal/hostile/regalrat/controlled(loc)
 	visible_message("<span class='warning'>[src] devours the cheese! He morphs into something... greater!</span>")
 	regalrat.say("RISE, MY SUBJECTS! SCREEEEEEE!")
 	if(mind)
diff --git a/code/modules/mob/living/simple_animal/hostile/regalrat.dm b/code/modules/mob/living/simple_animal/hostile/regalrat.dm
index a5f62f453b1..c250b8700a3 100644
--- a/code/modules/mob/living/simple_animal/hostile/regalrat.dm
+++ b/code/modules/mob/living/simple_animal/hostile/regalrat.dm
@@ -1,5 +1,9 @@
+#define MINOR_HEAL 10
+#define MEDIUM_HEAL 35
+#define MAJOR_HEAL 70
+
 /mob/living/simple_animal/hostile/regalrat
-	name = "regal rat"
+	name = "feral regal rat"
 	desc = "An evolved rat, created through some strange science. It leads nearby rats with deadly efficiency to protect its kingdom. Not technically a king."
 	icon_state = "regalrat"
 	icon_living = "regalrat"
@@ -26,9 +30,10 @@
 	ventcrawler = VENTCRAWLER_ALWAYS
 	unique_name = TRUE
 	faction = list("rat")
+	///The spell that the rat uses to scrounge up junk.
 	var/datum/action/cooldown/coffer
+	///The Spell that the rat uses to recruit/convert more rats.
 	var/datum/action/cooldown/riot
-	///Number assigned to rats and mice, checked when determining infighting.
 
 /mob/living/simple_animal/hostile/regalrat/Initialize()
 	. = ..()
@@ -36,7 +41,7 @@
 	riot = new /datum/action/cooldown/riot
 	coffer.Grant(src)
 	riot.Grant(src)
-	INVOKE_ASYNC(src, .proc/get_player)
+	AddElement(/datum/element/waddling)
 
 /mob/living/simple_animal/hostile/regalrat/proc/get_player()
 	var/list/mob/dead/observer/candidates = pollGhostCandidates("Do you want to play as the Royal Rat, cheesey be his crown?", ROLE_SENTIENCE, null, FALSE, 100, POLL_IGNORE_SENTIENCE_POTION)
@@ -44,6 +49,7 @@
 		var/mob/dead/observer/C = pick(candidates)
 		key = C.key
 		notify_ghosts("All rise for the rat king, ascendant to the throne in \the [get_area(src)].", source = src, action = NOTIFY_ORBIT, flashwindow = FALSE, header = "Sentient Rat Created")
+	to_chat(src, "<span class='notice'>You are an independent, invasive force on the station! Horde coins, trash, cheese, and the like from the safety of darkness!</span>")
 
 /mob/living/simple_animal/hostile/regalrat/handle_automated_action()
 	if(prob(20))
@@ -78,13 +84,32 @@
 
 /mob/living/simple_animal/hostile/regalrat/AttackingTarget()
 	. = ..()
+	if(health >= maxHealth)
+		to_chat(src, "<span class='warning'>You feel fine, no need to eat anything!</span>")
+		return
 	if(istype(target, /obj/item/reagent_containers/food/snacks/cheesewedge))
-		if (health >= maxHealth)
-			to_chat(src, "<span class='warning'>You feel fine, no need to eat anything!</span>")
-			return
-		to_chat(src, "<span class='green'>You eat \the [src], restoring some health.</span>")
-		heal_bodypart_damage(10)
+		to_chat(src, "<span class='green'>You eat [src], restoring some health.</span>")
+		heal_bodypart_damage(MINOR_HEAL)
 		qdel(target)
+		return
+	if(istype(target, /obj/item/reagent_containers/food/snacks/store/cheesewheel))
+		to_chat(src, "<span class='green'>You eat [src], restoring some health.</span>")
+		heal_bodypart_damage(MEDIUM_HEAL)
+		qdel(target)
+		return
+	if(istype(target, /obj/item/reagent_containers/food/snacks/royalcheese))
+		to_chat(src, "<span class='green'>You eat [src], revitalizing your royal resolve completely.</span>")
+		heal_bodypart_damage(MAJOR_HEAL)
+		qdel(target)
+		return
+
+/mob/living/simple_animal/hostile/regalrat/controlled
+	name = "regal rat"
+
+/mob/living/simple_animal/hostile/regalrat/controlled/Initialize()
+	. = ..()
+	INVOKE_ASYNC(src, .proc/get_player)
+
 
 /**
   *This action creates trash, money, dirt, and cheese.
@@ -202,6 +227,12 @@
 	return ..()
 
 /mob/living/simple_animal/hostile/rat/death(gibbed)
+	if(!ckey)
+		..(TRUE)
+		if(!gibbed)
+			var/obj/item/reagent_containers/food/snacks/deadmouse/mouse = new(loc)
+			mouse.icon_state = icon_dead
+			mouse.name = name
 	SSmobs.cheeserats -= src // remove rats on death
 	return ..()
 
@@ -270,5 +301,9 @@
 			to_chat(src, "<span class='warning'>You feel fine, no need to eat anything!</span>")
 			return
 		to_chat(src, "<span class='green'>You eat \the [src], restoring some health.</span>")
-		heal_bodypart_damage(5)
+		heal_bodypart_damage(MINOR_HEAL)
 		qdel(target)
+
+#undef MINOR_HEAL
+#undef MEDIUM_HEAL
+#undef MAJOR_HEAL