These are wild carpenter ants living in an old log. They could just as easily be tunneling through your house. They are attracted to dark damp areas and as a result, are often seen around kitchens, bathrooms and around other plumbing. Even if you have an infestation, you may see the ants in the house for only a short time in the Spring - or not at all. If you look carefully, you may see some ants carrying larvae in this picture.