diff --git a/code/__DEFINES/mobs.dm b/code/__DEFINES/mobs.dm
index 978e2daca8d..40548020e13 100644
--- a/code/__DEFINES/mobs.dm
+++ b/code/__DEFINES/mobs.dm
@@ -86,7 +86,7 @@
 #define BODYTYPE_CUSTOM (1<<6)
 // SKYRAT EDIT END
 
-//Defines for Species IDs
+// Defines for Species IDs. Used to refer to the name of a species, for things like bodypart names or species preferences.
 #define SPECIES_ABDUCTOR "abductor"
 #define SPECIES_ANDROID "android"
 #define SPECIES_DULLAHAN "dullahan"
@@ -115,6 +115,11 @@
 #define SPECIES_ZOMBIE_INFECTIOUS "memezombie"
 #define SPECIES_ZOMBIE_KROKODIL "krokodil_zombie"
 
+// Like species IDs, but not specifically attached a species.
+#define BODYPART_TYPE_ALIEN "alien"
+#define BODYPART_TYPE_ROBOTIC "robotic"
+#define BODYPART_TYPE_DIGITIGRADE "digitigrade"
+
 //See: datum/species/var/digitigrade_customization
 ///The species does not have digitigrade legs in generation.
 #define DIGITIGRADE_NEVER 0
diff --git a/code/modules/mob/living/carbon/alien/humanoid/alien_powers.dm b/code/modules/mob/living/carbon/alien/humanoid/alien_powers.dm
index 4c4ae7e7c1e..862e4190390 100644
--- a/code/modules/mob/living/carbon/alien/humanoid/alien_powers.dm
+++ b/code/modules/mob/living/carbon/alien/humanoid/alien_powers.dm
@@ -218,6 +218,9 @@ Doesn't work on other aliens/AI.*/
 /datum/action/cooldown/alien/acid/corrosion/PreActivate(atom/target)
 	if(get_dist(owner, target) > 1)
 		return FALSE
+	if(ismob(target)) //If it could corrode mobs, it would one-shot them.
+		owner.balloon_alert(owner, "doesn't work on mobs!")
+		return FALSE
 
 	return ..()
 
diff --git a/code/modules/surgery/bodyparts/parts.dm b/code/modules/surgery/bodyparts/parts.dm
index fa3d62d8fb3..b7aa3dc1263 100644
--- a/code/modules/surgery/bodyparts/parts.dm
+++ b/code/modules/surgery/bodyparts/parts.dm
@@ -48,6 +48,7 @@
 /obj/item/bodypart/chest/alien
 	icon = 'icons/mob/animal_parts.dmi'
 	icon_state = "alien_chest"
+	limb_id = BODYPART_TYPE_ALIEN
 	dismemberable = 0
 	max_damage = 500
 	animal_origin = ALIEN_BODYPART
@@ -156,6 +157,7 @@
 /obj/item/bodypart/l_arm/alien
 	icon = 'icons/mob/animal_parts.dmi'
 	icon_state = "alien_l_arm"
+	limb_id = BODYPART_TYPE_ALIEN
 	px_x = 0
 	px_y = 0
 	dismemberable = FALSE
@@ -257,6 +259,7 @@
 /obj/item/bodypart/r_arm/alien
 	icon = 'icons/mob/animal_parts.dmi'
 	icon_state = "alien_r_arm"
+	limb_id = BODYPART_TYPE_ALIEN
 	px_x = 0
 	px_y = 0
 	dismemberable = FALSE
@@ -349,6 +352,7 @@
 /obj/item/bodypart/l_leg/alien
 	icon = 'icons/mob/animal_parts.dmi'
 	icon_state = "alien_l_leg"
+	limb_id = BODYPART_TYPE_ALIEN
 	px_x = 0
 	px_y = 0
 	dismemberable = FALSE
@@ -448,6 +452,7 @@
 /obj/item/bodypart/r_leg/alien
 	icon = 'icons/mob/animal_parts.dmi'
 	icon_state = "alien_r_leg"
+	limb_id = BODYPART_TYPE_ALIEN
 	px_x = 0
 	px_y = 0
 	dismemberable = FALSE
diff --git a/code/modules/surgery/bodyparts/robot_bodyparts.dm b/code/modules/surgery/bodyparts/robot_bodyparts.dm
index a9fa1e4671a..3920fc6310d 100644
--- a/code/modules/surgery/bodyparts/robot_bodyparts.dm
+++ b/code/modules/surgery/bodyparts/robot_bodyparts.dm
@@ -13,7 +13,7 @@
 /obj/item/bodypart/l_arm/robot
 	name = "cyborg left arm"
 	desc = "A skeletal limb wrapped in pseudomuscles, with a low-conductivity case."
-	limb_id = "robotic"
+	limb_id = BODYPART_TYPE_ROBOTIC
 	attack_verb_simple = list("slapped", "punched")
 	inhand_icon_state = "buildpipe"
 	icon = 'icons/mob/augmentation/augments.dmi'
@@ -43,7 +43,7 @@
 	inhand_icon_state = "buildpipe"
 	icon_static = 'icons/mob/augmentation/augments.dmi'
 	icon = 'icons/mob/augmentation/augments.dmi'
-	limb_id = "robotic"
+	limb_id = BODYPART_TYPE_ROBOTIC
 	flags_1 = CONDUCT_1
 	icon_state = "borg_r_arm"
 	is_dimorphic = FALSE
@@ -69,7 +69,7 @@
 	inhand_icon_state = "buildpipe"
 	icon_static = 'icons/mob/augmentation/augments.dmi'
 	icon = 'icons/mob/augmentation/augments.dmi'
-	limb_id = "robotic"
+	limb_id = BODYPART_TYPE_ROBOTIC
 	flags_1 = CONDUCT_1
 	icon_state = "borg_l_leg"
 	is_dimorphic = FALSE
@@ -95,7 +95,7 @@
 	inhand_icon_state = "buildpipe"
 	icon_static =  'icons/mob/augmentation/augments.dmi'
 	icon = 'icons/mob/augmentation/augments.dmi'
-	limb_id = "robotic"
+	limb_id = BODYPART_TYPE_ROBOTIC
 	flags_1 = CONDUCT_1
 	icon_state = "borg_r_leg"
 	is_dimorphic = FALSE
@@ -120,7 +120,7 @@
 	inhand_icon_state = "buildpipe"
 	icon_static =  'icons/mob/augmentation/augments.dmi'
 	icon = 'icons/mob/augmentation/augments.dmi'
-	limb_id = "robotic"
+	limb_id = BODYPART_TYPE_ROBOTIC
 	flags_1 = CONDUCT_1
 	icon_state = "borg_chest"
 	is_dimorphic = FALSE
@@ -228,7 +228,7 @@
 	inhand_icon_state = "buildpipe"
 	icon_static = 'icons/mob/augmentation/augments.dmi'
 	icon = 'icons/mob/augmentation/augments.dmi'
-	limb_id = "robotic"
+	limb_id = BODYPART_TYPE_ROBOTIC
 	flags_1 = CONDUCT_1
 	icon_state = "borg_head"
 	is_dimorphic = FALSE
diff --git a/code/modules/surgery/bodyparts/species_parts/lizard_bodyparts.dm b/code/modules/surgery/bodyparts/species_parts/lizard_bodyparts.dm
index ab531416760..63c3878285b 100644
--- a/code/modules/surgery/bodyparts/species_parts/lizard_bodyparts.dm
+++ b/code/modules/surgery/bodyparts/species_parts/lizard_bodyparts.dm
@@ -34,7 +34,7 @@
 /obj/item/bodypart/l_leg/digitigrade
 	icon_greyscale = 'icons/mob/species/lizard/bodyparts.dmi'
 	uses_mutcolor = TRUE
-	limb_id = "digitigrade"
+	limb_id = BODYPART_TYPE_DIGITIGRADE
 	bodytype = BODYTYPE_HUMANOID | BODYTYPE_ORGANIC | BODYTYPE_DIGITIGRADE
 
 /obj/item/bodypart/l_leg/digitigrade/update_limb(dropping_limb = FALSE, is_creating = FALSE)
@@ -53,15 +53,15 @@
 			shoes_compatible = TRUE
 
 		if((uniform_compatible && suit_compatible && shoes_compatible) || (suit_compatible && shoes_compatible && human_owner.wear_suit?.flags_inv & HIDEJUMPSUIT)) //If the uniform is hidden, it doesnt matter if its compatible
-			limb_id = "digitigrade"
+			limb_id = BODYPART_TYPE_DIGITIGRADE
 
 		else
-			limb_id = "lizard"
+			limb_id = SPECIES_LIZARD
 
 /obj/item/bodypart/r_leg/digitigrade
 	icon_greyscale = 'icons/mob/species/lizard/bodyparts.dmi'
 	uses_mutcolor = TRUE
-	limb_id = "digitigrade"
+	limb_id = BODYPART_TYPE_DIGITIGRADE
 	bodytype = BODYTYPE_HUMANOID | BODYTYPE_ORGANIC | BODYTYPE_DIGITIGRADE
 
 /obj/item/bodypart/r_leg/digitigrade/update_limb(dropping_limb = FALSE, is_creating = FALSE)
@@ -80,8 +80,7 @@
 			shoes_compatible = TRUE
 
 		if((uniform_compatible && suit_compatible && shoes_compatible) || (suit_compatible && shoes_compatible && human_owner.wear_suit?.flags_inv & HIDEJUMPSUIT)) //If the uniform is hidden, it doesnt matter if its compatible
-			limb_id = "digitigrade"
-
+			limb_id = BODYPART_TYPE_DIGITIGRADE
 		else
-			limb_id = "lizard"
+			limb_id = SPECIES_LIZARD
 */
diff --git a/modular_skyrat/modules/customization/modules/mob/living/carbon/human/species/ghoul.dm b/modular_skyrat/modules/customization/modules/mob/living/carbon/human/species/ghoul.dm
index 0bd240e57c1..8bc0c7139ad 100644
--- a/modular_skyrat/modules/customization/modules/mob/living/carbon/human/species/ghoul.dm
+++ b/modular_skyrat/modules/customization/modules/mob/living/carbon/human/species/ghoul.dm
@@ -1,7 +1,7 @@
 /datum/species/ghoul
 	name = "Ghoul"
 	id = SPECIES_GHOUL
-	examine_limb_id = "ghoul"
+	examine_limb_id = SPECIES_GHOUL
 	say_mod = "rasps"
 	species_traits = list(NOEYESPRITES, DYNCOLORS, HAS_FLESH, HAS_BONE, HAIR, FACEHAIR)
 	can_have_genitals = FALSE //WHY WOULD YOU WANT TO FUCK ONE OF THESE THINGS?