<reponame>jonasvdd/DS-python-data-analysis<filename>notebooks/_solutions/case2_observations_processing30.py
unique_species_annotated = pd.merge(unique_species, df_species_annotated_subset,
                                    left_index=True, right_index=True)
unique_species_annotated = pd.merge(unique_species, df_species_annotated_subset,
                                    left_index=True, right_index=True)