Aliens and monkeys can now climb structures

code/game/objects/structures.dm

@@ -60,7 +60,7 @@
 	. = ..()
 	if(!climbable)
 		return
-	if(ismob(O) && user == O && ishuman(user))
+	if(ismob(O) && user == O && iscarbon(user))
 		if(user.canmove)
 			climb_structure(user)
 			return
@@ -81,6 +81,8 @@
 	var/adjusted_climb_time = climb_time
 	if(user.restrained()) //climbing takes twice as long when restrained.
 		adjusted_climb_time *= 2
+	if(istype(user, /mob/living/carbon/alien))
+		adjusted_climb_time *= 0.25 //aliens are terrifyingly fast
 	structureclimber = user
 	if(do_mob(user, user, adjusted_climb_time))
 		if(src.loc) //Checking if structure has been destroyed
@@ -92,8 +94,12 @@
 				user.Stun(climb_stun)
 			else
 				user << "<span class='warning'>You fail to climb onto [src].</span>"
+				density = 1
+				structureclimber = null
+				return 0
 			density = 1
 			structureclimber = null
 			return 1
-	structureclimber = null
-	return ..()
+	else
+		structureclimber = null
+		return 0