diff --git a/code/__DEFINES/mobs.dm b/code/__DEFINES/mobs.dm
index f712dc487d5..514dedc6c71 100644
--- a/code/__DEFINES/mobs.dm
+++ b/code/__DEFINES/mobs.dm
@@ -422,7 +422,8 @@
 #define MAX_REVIVE_FIRE_DAMAGE 180
 #define MAX_REVIVE_BRUTE_DAMAGE 180
 
-#define HUMAN_FIRE_STACK_ICON_NUM 3
+// If a mob has a higher threshold than this, the icon shown will be increased to the big fire icon.
+#define MOB_BIG_FIRE_STACK_THRESHOLD 3
 
 #define GRAB_PIXEL_SHIFT_PASSIVE 6
 #define GRAB_PIXEL_SHIFT_AGGRESSIVE 12
diff --git a/code/modules/mob/living/carbon/carbon.dm b/code/modules/mob/living/carbon/carbon.dm
index d43972150ce..6d90da8c6ce 100644
--- a/code/modules/mob/living/carbon/carbon.dm
+++ b/code/modules/mob/living/carbon/carbon.dm
@@ -1414,27 +1414,3 @@
 	our_splatter.blood_dna_info = get_blood_dna_list()
 	var/turf/targ = get_ranged_target_turf(src, splatter_direction, splatter_strength)
 	our_splatter.fly_towards(targ, splatter_strength)
-
-/mob/living/carbon/update_fire_overlay(stacks, on_fire, last_icon_state, suffix = "")
-	var/fire_icon = "generic_burning[suffix]"
-
-	if(!GLOB.fire_appearances[fire_icon])
-		var/mutable_appearance/new_fire_overlay = mutable_appearance('icons/mob/onfire.dmi', fire_icon, -FIRE_LAYER)
-		new_fire_overlay.appearance_flags = RESET_COLOR
-		GLOB.fire_appearances[fire_icon] = new_fire_overlay
-
-	if((stacks > 0 && on_fire) || HAS_TRAIT(src, TRAIT_PERMANENTLY_ONFIRE))
-		if(fire_icon == last_icon_state)
-			return last_icon_state
-
-		remove_overlay(FIRE_LAYER)
-		overlays_standing[FIRE_LAYER] = GLOB.fire_appearances[fire_icon]
-		apply_overlay(FIRE_LAYER)
-		return fire_icon
-
-	if(!last_icon_state)
-		return last_icon_state
-
-	remove_overlay(FIRE_LAYER)
-	apply_overlay(FIRE_LAYER)
-	return null
diff --git a/code/modules/mob/living/carbon/carbon_update_icons.dm b/code/modules/mob/living/carbon/carbon_update_icons.dm
index bcedf7a42ca..17f0ba53f33 100644
--- a/code/modules/mob/living/carbon/carbon_update_icons.dm
+++ b/code/modules/mob/living/carbon/carbon_update_icons.dm
@@ -77,6 +77,28 @@
 	overlays_standing[HANDS_LAYER] = hands
 	apply_overlay(HANDS_LAYER)
 
+/mob/living/carbon/update_fire_overlay(stacks, on_fire, last_icon_state, suffix = "")
+	var/fire_icon = "[dna?.species.fire_overlay || "human"]_[stacks > MOB_BIG_FIRE_STACK_THRESHOLD ? "big_fire" : "small_fire"][suffix]"
+
+	if(!GLOB.fire_appearances[fire_icon])
+		GLOB.fire_appearances[fire_icon] = mutable_appearance('icons/mob/onfire.dmi', fire_icon, -FIRE_LAYER, appearance_flags = RESET_COLOR)
+
+	if((stacks > 0 && on_fire) || HAS_TRAIT(src, TRAIT_PERMANENTLY_ONFIRE))
+		if(fire_icon == last_icon_state)
+			return last_icon_state
+
+		remove_overlay(FIRE_LAYER)
+		overlays_standing[FIRE_LAYER] = GLOB.fire_appearances[fire_icon]
+		apply_overlay(FIRE_LAYER)
+		return fire_icon
+
+	if(!last_icon_state)
+		return last_icon_state
+
+	remove_overlay(FIRE_LAYER)
+	apply_overlay(FIRE_LAYER)
+	return null
+
 /mob/living/carbon/update_damage_overlays()
 	remove_overlay(DAMAGE_LAYER)
 
diff --git a/code/modules/mob/living/carbon/human/human_defense.dm b/code/modules/mob/living/carbon/human/human_defense.dm
index d43b174e493..98ae8b5aa3e 100644
--- a/code/modules/mob/living/carbon/human/human_defense.dm
+++ b/code/modules/mob/living/carbon/human/human_defense.dm
@@ -1024,35 +1024,6 @@
 	for(var/obj/item/burning in burning_items)
 		burning.fire_act((stacks * 25 * delta_time)) //damage taken is reduced to 2% of this value by fire_act()
 
-/mob/living/carbon/human/update_fire_overlay(stacks, on_fire, last_icon_state, suffix = "")
-	var/fire_icon = "generic_burning[suffix]"
-	if(stacks > HUMAN_FIRE_STACK_ICON_NUM)
-		if(dna && dna.species)
-			fire_icon = "[dna.species.fire_overlay][suffix]"
-		else
-			fire_icon = "human_burning[suffix]"
-
-	if(!GLOB.fire_appearances[fire_icon])
-		var/mutable_appearance/new_fire_overlay = mutable_appearance('icons/mob/onfire.dmi', fire_icon, -FIRE_LAYER)
-		new_fire_overlay.appearance_flags = RESET_COLOR
-		GLOB.fire_appearances[fire_icon] = new_fire_overlay
-
-	if((stacks > 0 && on_fire) || HAS_TRAIT(src, TRAIT_PERMANENTLY_ONFIRE))
-		if(fire_icon == last_icon_state)
-			return last_icon_state
-
-		remove_overlay(FIRE_LAYER)
-		overlays_standing[FIRE_LAYER] = GLOB.fire_appearances[fire_icon]
-		apply_overlay(FIRE_LAYER)
-		return fire_icon
-
-	if(!last_icon_state)
-		return last_icon_state
-
-	remove_overlay(FIRE_LAYER)
-	apply_overlay(FIRE_LAYER)
-	return null
-
 /mob/living/carbon/human/on_fire_stack(delta_time, times_fired, datum/status_effect/fire_handler/fire_stacks/fire_handler)
 	SEND_SIGNAL(src, COMSIG_HUMAN_BURNING)
 	burn_clothing(delta_time, times_fired, fire_handler.stacks)
diff --git a/code/modules/mob/living/carbon/human/species.dm b/code/modules/mob/living/carbon/human/species.dm
index cff2f37f4eb..5986ab77e7a 100644
--- a/code/modules/mob/living/carbon/human/species.dm
+++ b/code/modules/mob/living/carbon/human/species.dm
@@ -165,7 +165,7 @@ GLOBAL_LIST_EMPTY(features_by_species)
 	var/bodytemp_cold_damage_limit = BODYTEMP_COLD_DAMAGE_LIMIT
 
 	/// The icon_state of the fire overlay added when sufficently ablaze and standing. see onfire.dmi
-	var/fire_overlay = "human_burning"
+	var/fire_overlay = "human"
 
 	///the species that body parts are surgically compatible with (found in _DEFINES/mobs.dm)
 	///current acceptable bitfields are HUMAN_BODY, ALIEN_BODY, LARVA_BODY, MONKEY_BODY, or NONE
diff --git a/code/modules/mob/living/carbon/human/species_types/monkeys.dm b/code/modules/mob/living/carbon/human/species_types/monkeys.dm
index a10d9c76dac..26b407fcdcd 100644
--- a/code/modules/mob/living/carbon/human/species_types/monkeys.dm
+++ b/code/modules/mob/living/carbon/human/species_types/monkeys.dm
@@ -54,7 +54,7 @@
 		BODY_ZONE_R_LEG = /obj/item/bodypart/r_leg/monkey,
 		BODY_ZONE_CHEST = /obj/item/bodypart/chest/monkey,
 	)
-	fire_overlay = "monkey_burning"
+	fire_overlay = "monkey"
 	dust_anim = "dust-m"
 	gib_anim = "gibbed-m"
 
diff --git a/code/modules/mob/living/silicon/robot/robot.dm b/code/modules/mob/living/silicon/robot/robot.dm
index 1b201c068fb..c8794504782 100644
--- a/code/modules/mob/living/silicon/robot/robot.dm
+++ b/code/modules/mob/living/silicon/robot/robot.dm
@@ -985,7 +985,7 @@
 	to_chat(src, span_notice("Your frustration has empowered you! You can now right yourself faster!"))
 
 /mob/living/silicon/robot/update_fire_overlay(stacks, on_fire, last_icon_state, suffix = "")
-	var/fire_icon = "generic_burning[suffix]"
+	var/fire_icon = "generic_fire[suffix]"
 
 	if(!GLOB.fire_appearances[fire_icon])
 		var/mutable_appearance/new_fire_overlay = mutable_appearance('icons/mob/onfire.dmi', fire_icon, -FIRE_LAYER)
diff --git a/icons/mob/onfire.dmi b/icons/mob/onfire.dmi
index 4fa6ec88acd..09ffc089c78 100644
Binary files a/icons/mob/onfire.dmi and b/icons/mob/onfire.dmi differ