During monitoring at the Dívčí Hrady site in 2022, we counted 672 individuals of Chapman´ s blue (Polyommatus thersites). This species became extinct in Prague approximately 20 years ago, and in 2018 our team managed to return it to the nature of Prague. The P. thersites population would thrive here thanks to the proper management of the site, which consists of gradual strip and mosaic hay cutting. In this way, the nutrient plant of this species – Onobrychis viciifolia – can be seeded and spread from the fields we have established into the surrounding area. The monitoring will continue in 2023 as well.