Hi; Two points...I have a feeling the Congress Street Bridge in Austin, Texas is home to millions of bats who are an area tourist attraction for their evening descent to feed. I think bats would see spiders as food.
The other, my experience of surprise when I saw results of film devepment:
Wisconsin..my home base...in winter occasionally has hoar-frost, a delicate tracery of frost crystals on every weed and leaf over a valley or moisture-swept plain...a beautiful, short-lived sight before the sun warms it away. So I was out with my camera one time, and saw that chicken wire, which I had stretched across something in the garden, was edged with tiny little white teeth of frost...looking like lace edging the wires, so of course I homed in on the needed focus, clicked, then went looking for more to shoot.
When I got the pictures back from development, to my amazement, there right in the middle, behind the frosted chicken wire sat my neighbor's husky dog, intently watching me at my work !
Although he couldn't have been more than 3 feet from me, he had said not a murmer, as was his way, as a husky...curious to watch instead of speaking up. But it made a great photo.