Columns description: Date: Time indicates the date and time of each data Month: indicates the month and time of each data Day: Fraction indicates the fraction of the day of each date based on its date and time Indv.ID: indicates the identity of each bird. Altitude: indicates the altitude of flight of each data. It is the response variable for models of flight altitude, hence it is present only in the database used for those models. Flying: indicates if each data correspond to flying (1) or non-flying (0) behaviour. It is the response variable for models of flight probability, hence it is present only in the database used for those models.