Added var/small to mobs, which currently only handles if they can open airlocks. This replaces the use of ismouse().

code/modules/mob/living/simple_animal/friendly/crab.dm

@@ -5,6 +5,7 @@
 	icon_state = "crab"
 	icon_living = "crab"
 	icon_dead = "crab_dead"
+	small = 1
 	speak_emote = list("clicks")
 	emote_hear = list("clicks")
 	emote_see = list("clacks")

code/modules/mob/living/simple_animal/friendly/farm_animals.dm

@@ -167,6 +167,7 @@
 	health = 1
 	var/amount_grown = 0
 	pass_flags = PASSTABLE | PASSGRILLE
+	small = 1
 
 /mob/living/simple_animal/chick/New()
 	..()
@@ -208,6 +209,7 @@ var/global/chicken_count = 0
 	var/eggsleft = 0
 	var/color
 	pass_flags = PASSTABLE
+	small = 1
 
 /mob/living/simple_animal/chicken/New()
 	..()

code/modules/mob/living/simple_animal/friendly/lizard.dm

@@ -5,6 +5,7 @@
 	icon_state = "lizard"
 	icon_living = "lizard"
 	icon_dead = "lizard-dead"
+	small = 1
 	speak_emote = list("hisses")
 	health = 5
 	maxHealth = 5

code/modules/mob/living/simple_animal/friendly/mouse.dm

@@ -10,6 +10,7 @@
 	emote_hear = list("squeeks","squeaks","squiks")
 	emote_see = list("runs in a circle", "shakes", "scritches at something")
 	pass_flags = PASSTABLE
+	small = 1
 	speak_chance = 1
 	turns_per_move = 5
 	see_in_dark = 6

code/modules/mob/living/simple_animal/friendly/mushroom.dm

@@ -4,6 +4,7 @@
 	icon_state = "mushroom"
 	icon_living = "mushroom"
 	icon_dead = "mushroom_dead"
+	small = 1
 	speak_chance = 0
 	turns_per_move = 1
 	maxHealth = 5

code/modules/mob/living/simple_animal/parrot.dm

@@ -33,6 +33,7 @@
 	icon_living = "parrot_fly"
 	icon_dead = "parrot_dead"
 	pass_flags = PASSTABLE
+	small = 1
 
 	speak = list("Hi","Hello!","Cracker?","BAWWWWK george mellons griffing me")
 	speak_emote = list("squawks","says","yells")

code/modules/mob/mob_defines.dm

@@ -79,6 +79,7 @@
 	var/eye_stat = null//Living, potentially Carbon
 	var/lastpuke = 0
 	var/unacidable = 0
+	var/small = 0
 
 	var/name_archive //For admin things like possession