Don't look at this post (if you are afraid of spiders)
http://www.livescience.com/13909-brown-recluse-spider-range-climate-change.html
Climate change may give America's venomous brown recluse spiders a choice: Move to a more northern state or face dramatic losses in range and possible extinction, a new theoretical study suggests.
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If the projections are correct, by 2080, perhaps only 5 percent of the spider's current range — which extends from Kansas across to Kentucky and from Texas across to Georgia, including the states in between — would remain suitable for it. However, climate change could make portions of Wisconsin, Michigan, Indiana, Ohio, Pennsylvania, New York, Nebraska and South Dakota habitable to the spiders.
The shaded region represents the current distribution of the brown recluse
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Of course, brown recluse spiders aren't the only living things whose habitat is affected by climate change.
"It is scary to think that if this much change could happen in one species, what could happen in the myriad species that exist all over the Earth?" Saupe said.
= new reply since forum marked as read
I hope it lives under the porch, and likes to eat spiders, bugs, and rodents. 
We used to see a toad occasionally in our yard in the early evening, but not in recent years. I was talking with our neighbor who has lived here much of his life, and he said he thought it was due to people conserving water- lawns and gardens no longer provide a consistently damp environment. I know some people around here have insecticide sprayed around their yards/foundations, which can't be good for birds, reptiles, and amphibians, either.
Many species are now found at higher elevations, as well as higher latitudes-
http://www.aaas.org/news/releases/2011/0818sp_species.shtml
I'd take mosquitoes, wasps and ants over even a small amount of spiders. 
or Fern?
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