Animals now leave pawprints in snow.

code/modules/mob/living/carbon/human/update_icons.dm

@@ -364,7 +364,7 @@ var/global/list/damage_icon_parts = list() //see UpdateDamageIcon()
 		overlays_standing[SKIN_LAYER] = skin
 		apply_layer(SKIN_LAYER)
 
-/mob/living/carbon/human/proc/update_bloodied()
+/mob/living/carbon/human/update_bloodied()
 	if(QDESTROYING(src))
 		return
 

code/modules/mob/living/living.dm

@@ -1168,3 +1168,19 @@
 
 /mob/living/proc/leaves_tracks_type()
 	return
+
+/mob/living/proc/update_bloodied()
+	return
+
+/mob/living/proc/walk_through_blood(var/obj/effect/decal/cleanable/blood/blood)
+	if(!leaves_tracks_type())
+		return FALSE
+	feet_blood_color = blood.basecolor
+	track_blood = max(blood.amount, track_blood)
+	LAZYINITLIST(feet_blood_DNA)
+	feet_blood_DNA |= blood.blood_DNA.Copy()
+	update_bloodied()
+
+/mob/living/proc/get_snow_footprint_state()
+	if(!hovering) // Flying things shouldn't make footprints.
+		return "snow_footprints"

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

@@ -38,6 +38,10 @@
 /mob/living/simple_mob/animal/proc/has_appetite()
 	return TRUE
 
+/mob/living/simple_mob/animal/get_snow_footprint_state()
+	if(!hovering)
+		return "snow_animalprint"
+
 /mob/living/simple_mob/animal/do_interaction(var/atom/A)
 
 	// Can we do some critter interaction?