We offer a full range of resistant species. Of course we have several wild strains of bed bugs that we document their resistant levels on a regular basis. And because we have the largest captive populations of bed bugs we also challenge one of strains on a regular basis to help ensure the level of resistance to a variety of actives. Our next most common resistant species is our darkling beetles from poultry houses (we also maintain one of the few susceptible darkling beetle strains in captivity to ensure we can provide resistant profiles of field populations). Other resistant species we maintain include Cigarette beetles, German cockroaches, Horn flies, and we continue to add others as we can. If you have a need for a resistant species that we do not have available, we may be able to create a suitable resistance level if you have enough time for us to so.