reintroduction(Reintroduction of exterminated species in an area; it is bound to fail if the chosen animal became extinct in the area too long ago and if the area itself has undergone too many changes. Reintroduction needs years of careful planning - the approval of local population, technical conditions of the release, feeding system, protection and breeding control - and even then some unexpected problems may arise)
relational database(A collection of digital information items organized as a set of formally described tables from which the information can be accessed or reassembled in different ways without reorganizing the tables)