There are all kinds of different possible intruders. If you are not sure what kind of pest you are dealing with check out BugInfo.com for a full list of insects, rodents, spiders, etc., along with pictures and a description of each. You are also welcome to call us at (617) 361-3118 and we will be happy to come out and give you a free consultation or answer any questions you have. we have been in business almost 90 years.