"There are still lots of gaps in our knowledge of UK moths – hardly surprising given that we have 2,500 or so species here. For some, we still don’t know their natural food plant. For others, we don’t know if they still exist here. In this latter regard, it seems incredible to me that we are still arguing about the scale of in the UK, and what the causes of those declines are. We think moth numbers have probably dropped by 30% since 1970, but that information is only available for the commoner species of larger moths, and may be biased in various ways. While we have a rich history of moth recording, and some good data for moth population changes, we could really do with more."