Carry-able chickens (and lizards)

code/modules/mob/holder.dm

@@ -177,6 +177,16 @@ var/global/list/holder_mob_icon_cache = list()
 	for(var/mob/M in src.contents)
 		M.attackby(W,user)
 
+/obj/item/holder/chicken
+	origin_tech = list(TECH_BIO = 2)
+
+/obj/item/holder/chick
+	w_class = ITEMSIZE_TINY
+	origin_tech = list(TECH_BIO = 1)
+
+/obj/item/holder/lizard
+	w_class = ITEMSIZE_TINY
+
 //Mob procs and vars for scooping up
 /mob/living/var/holder_type
 

code/modules/mob/living/simple_mob/subtypes/animal/farm animals/chicken.dm

@@ -29,6 +29,8 @@ GLOBAL_VAR_INIT(chicken_count, 0)	// How mant chickens DO we have?
 	meat_amount = 2
 	meat_type = /obj/item/reagent_containers/food/snacks/meat/chicken
 
+	holder_type = /obj/item/holder/chicken
+
 	var/eggsleft = 0
 	var/body_color
 
@@ -131,6 +133,8 @@ GLOBAL_VAR_INIT(chicken_count, 0)	// How mant chickens DO we have?
 
 	var/amount_grown = 0
 
+	holder_type = /obj/item/holder/chick
+
 /mob/living/simple_mob/animal/passive/chick/Initialize()
 	. = ..()
 	pixel_x = rand(-6, 6)

code/modules/mob/living/simple_mob/subtypes/animal/passive/lizard.dm

@@ -23,6 +23,8 @@
 
 	say_list_type = /datum/say_list/lizard
 
+	holder_type = /obj/item/holder/lizard
+
 /mob/living/simple_mob/animal/passive/lizard/large
 	desc = "A cute, big lizard."
 	maxHealth = 20
@@ -32,6 +34,7 @@
 	melee_damage_upper = 15
 
 	attack_sharp = TRUE
+	holder_type = null
 
 /mob/living/simple_mob/animal/passive/lizard/large/Initialize()
 	. = ..()