Rules - The patch must be set previously and the observer can only travel within the delimitations. - All the species included on the official Portuguese list (BUBO, IOC taxonomy) count if seen and/or heard. - Travelling within the patch must be made by “green” transportation (by foot, bicycle). - Travelling to the patch must be made by “green” transportation or by collective transportation (bus, train, car pooling included). - Travelling by non-green transportation is only allowed to a patch close to the work location, if the work location is permanent.