What is the fine-grained topic of the following text: Any perception of increased activity could be explained by the regular summer abundance of a few conspicuous species, including Common Green Darner (Anax junius), Wandering Glider (Pantala flavescens), Black Saddlebags (Tramea lacerata) and others that frequent urban and suburban habitats. Only return the topic.
Increased activity of certain conspicuous species during summer