Transfer on evolve/devolve

code/modules/mob/living/carbon/xenomorph/Xenomorph.dm

@@ -766,6 +766,11 @@
 	var/datum/mob_hud/MH = GLOB.huds[MOB_HUD_XENO_INFECTION]
 	MH.add_hud_to(src, src)
 
+// Transfer any observing players over to the xeno's new body (`target`) on evolve/de-evolve.
+/mob/living/carbon/xenomorph/transfer_observers_to(atom/target)
+	for(var/mob/dead/observer/observer as anything in observers)
+		observer.clean_observe_target()
+		observer.do_observe(target)
 
 /mob/living/carbon/xenomorph/check_improved_pointing()
 	//xeno leaders get a big arrow and less cooldown

code/modules/mob/mob_defines.dm

@@ -28,7 +28,8 @@
 	I'll make some notes on where certain variable defines should probably go.
 	Changing this around would probably require a good look-over the pre-existing code.
 	*/
-	var/list/observers //The list of people observing this mob.
+	/// The list of people observing this mob.
+	var/list/mob/dead/observer/observers
 	var/zone_selected = "chest"
 
 	var/use_me = 1 //Allows all mobs to use the me verb by default, will have to manually specify they cannot
@@ -429,4 +430,3 @@
 			return
 
 		src.regenerate_icons()
-