Believe it or not, quite a lot.
Moths are major bio-indicators and moth biodiversity and habitat biodiversity, or lack of it, are linked. My friend Veronica French recently contributed to a large-scale study of moths for a paper about the relationship between tree biodiversity in forests and arthropod biodiversity (like insects, spiders, etc.), just published in the scientific journal Forest Ecology and Management under the title “Can Mixed Species Stands Enhance Arthropod Diversity in Plantation Forests?”:
Now we are in October there are very few moths and butterflies around, but nevertheless you will see this smallish moth at your windows, the Hebrew Character – Orthosia gothica. It is important to remember that although they might not be on the wing so much, if at all, these species are still going about their lives in the countryside, albeit as caterpillars, or in suspended animation as pupae, which will later hatch out into adult moths.