cosmetic parts are working

hyperstation/code/modules/mob/dead/new_player/cosmetic_parts.dm

@@ -12,18 +12,40 @@ fails and the part is rejected. so you can't attach mammal-bird legs to avians
 safely.
 */
 
+#define COSMETIC_BASIC_SPECIES = list("mammal", "avian", "aquatic", "insect", "xeno", "synthliz")
+
+
 /datum/cosmetic_part
 	var/name
 	var/icon = 'hyperstation/icons/mob/char_parts.dmi'
 	var/icon_state
 	var/support_digitigrade = TRUE
+	var/list/supported_species
 
 /datum/cosmetic_part/head
 /datum/cosmetic_part/chest
 /datum/cosmetic_part/arms
 /datum/cosmetic_part/legs
 
+/datum/cosmetic_part/head/default
+	name = "default"
+	icon = null
+
+/datum/cosmetic_part/chest/default
+	name = "default"
+	icon = null
+
+/datum/cosmetic_part/arms/default
+	name = "default"
+	icon = null
+
+/datum/cosmetic_part/legs/default
+	name = "default"
+	icon = null
+
 /datum/cosmetic_part/legs/avian
 	name = "avian"
 	icon = 'modular_citadel/icons/mob/mutant_bodyparts.dmi'
-	icon_state = "avian"
+	icon_state = "avian"
+	supported_species = COSMETIC_BASIC_SPECIES
+	support_digitigrade = FALSE

hyperstation/code/modules/mob/living/carbon/human/cosmetic_part_handler.dm

@@ -1,15 +1,14 @@
 /obj/item/bodypart/proc/apply_cosmetic(datum/cosmetic_part/part)
 	if(!is_organic_limb() || animal_origin || !part)
 		return
-	cosmetic_icon = part.icon_state
-	icon = part.icon
+	cosmetic_icon = part
+
 
 /mob/living/carbon/human/proc/handle_cosmetic_parts()
-	var/features = src.dna.features
+	var/features = dna.features
 	var/list/body_zones = list(BODY_ZONE_HEAD, BODY_ZONE_CHEST, BODY_ZONE_L_ARM, BODY_ZONE_R_ARM, BODY_ZONE_L_LEG, BODY_ZONE_R_LEG)
-	for(var/I in body_zones)
-		var/zone = body_zones[I]
-		var/cosmetic_pref = features["cosmetic_" + zone]
+	for(var/zone in body_zones)
+		var/datum/cosmetic_part/cosmetic_pref = features["cosmetic_" + zone]
 		if(!istype(cosmetic_pref, /datum/cosmetic_part))
 			continue
 		var/datum/cosmetic_part/part = cosmetic_pref