What do Drosophilas and birds have in common? In this lecture, a candidate of biological sciences will explain how certain bird species become the key to scientific breakthroughs. Tatiana Ilyina, a candidate of biological sciences, will discuss how fundamental science operates when it focuses not on the entire species diversity but on a single species. And why this is not only effective but also incredibly exciting. What makes a sparrow or a finch a model species? What discovery about the behavior or physiology of birds could change our understanding of humans? Why do scientists observe a single population for years and never tire of being amazed? The lecture will not only unveil the scientific kitchen of ornithology but also demonstrate how important it is to focus on the small to understand the larger picture. The lecture is part of the series of events by the ecological club "Go Green!" and the project "Summer Walks," which unite people interested in nature, science, and a conscious lifestyle. The lecture will be interesting for both those who are just discovering the world of biology and those who want to delve into its intricacies. Tatiana Ilyina is a senior researcher at the Department of Vertebrate Zoology of the Biological Faculty of Lomonosov Moscow State University, known for her popular science presentations and participation in interdisciplinary projects. Admission is free, registration is not required. Where to go in Moscow today will be told by our website.