One would think that all snails would be in danger of being eaten if they venture on to the nest.
Last April, after a strong rain there were at least three slugs like this one roaming about on the nest.
A few ants roamed around, but not as many as when the mound is dry.
The roused bear 
Hi Harlan,
I have a question about slugs. I don’t know anything about them, and there don’t seem to be many online resources. Do you have any suggestions about places I could look to find identification tools or photos of different species?
Here’s a slug I found this morning on our land is western Wisconsin:
It’s bigger than any slug I’ve seen before – about 2.5 inches long. I’d like to know more about it, and maybe learn about the other, smaller ones I see more often.
Marcie
Wow. I haven’t seen one quite like that before. There is a slug key here: http://www.carnegiemnh.org/mollusks/palandsnails/key.html
I would have a tendency to go with Deroceras, but this one is awfully light compared to most I have seen. Unfortunately, there is not a lot of good information out there on slugs, and I think there is a lot of opportunity to learn more about them (but from nature, not from books.)
Thanks for the link to the key!
I get to Arion subfuscus. I also found slugs in “How to Know the Eastern Land Snails” by John Burch, and got to the same ID. It’s hard to see if I’m right from the photos – none of them look quite the same.
I also found this site: http://mypage.siu.edu/mlcopp/species_list.html
and it looks like there are several Arion species in Illinois – so maybe they’ve found their way to Wisconsin too?
I looked through my photos and (now that I know the characteristics I need to look for) I found a better one: http://prhvn.com/wp-content/uploads/2009/07/yellow-slug-2-9-11-10.jpg
Easier to see the foot; and is that indentation the breathing pore?
Yes, that is the breathing pore. Too bad there is not better information out there. At least there is some.