skunk den top view
I get asked what skunk dens look like. Here is some pictures of a skunk den site in a retaining wall. I ended up catching four skunks out of this den before closing off the hole. This entrance is a lot bigger than a normal den entrance, the typical den entrance is slightly larger than a softball.
These pictures where taken during the breeding season, normally there would be less sign than pictured here. You can see how well used the trails leading away from this den are. If the skunks were not removed June-August time frame the home owner would start seeing kits out at all times even during daylight. The young skunks can spray at this time typically they spray more readily than the adult skunks. The young skunks spray is not as potent as the adults, but can still pack a punch. 
I occasionally will catch raccoons, opossums and woodchucks (ground hogs) along with the skunks out of den sites like this. It is possible to have many types of animals coexisting in a one spot, happens most often with woodchucks. Woodchuck dens tend to have many chambers and attract a variety of critters.
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Skunk den in a crawl space CT.