In fact, if you visited the sanctuaries in the evening--as the temperatures were dropping--you'd see the forest floor fluttering with shivering monarch butterflies.
(you; visited; the sanctuaries; T:in the evening) (the temperatures; were dropping; ) (you; 'd see; the forest floor fluttering with shivering monarch butterflies; T:as the temperatures were dropping) Context(you 'd see,List([91, 100))):(the forest floor; fluttering; )
you 'd see,List([91, 100))
you the temperatures you the forest floor
visited were dropping 'd see fluttering
the sanctuaries T:in the evening
the forest floor fluttering with shivering monarch butterflies T:as the temperatures were dropping