This document discusses modeling species distributions based on interactions between climate and habitat. It summarizes a study that used distribution data from 12 habitat types and 3 climate variables to model how two butterfly species' habitat use changes with climate. The study found that adding coniferous forest reduced one species' presence in some areas but improved it in others. For another species, adding grassland habitat improved its presence while adding bare ground reduced it. The study also showed how this species' distribution changed with increasing growing degree days. It concludes that improving marginal habitat or weather conditions could help species at their range margins.