By subscribing to www.ornitho.cat, you can access the corresponding database, except for some species which remain "hidden". These are identified with a key in front of each data, which con only be seen by their author and the site managers. These species are listed below. However, the data regarding these species can be accessed in all syntheses includding the atlas maps etc. Each participant can hide his/her own data at any time even for species outside this list.