Compiling research data from a wide variety of sources is of great value in itself! But this also brings with it the problem of data comparability! This process was unfortunately not explained sufficiently. It should be addressed in more detail in the text. Phenological data are tied to geographical regions or the altitudinal zones at which the plants occur. Therefore, there must be clear differences in the data sources. This requires linking with the geodata. If you use phenological data from larger countries or countries with large altitudinal gradients, you get larger volumes of flowering times for one and the same species. These problems were not addressed in the database. Another important point: Why do insects or other animal groups visit flowers? Is it the pollen of interest? Is it the nectar? Is it the oils in the flower? Or do animals visit flowers because they have been deceived by the morphology or color of the flowers?

These questions are not addressed and require supplementation or at least discussion!

However, the text should better describe the database categories and the handling of the different data qualities. How were plausibility tests carried out?