Distributed on four levels and on a 6.000 m² surface, the collections of the museum are absorbed in a little dark environment, requiring some minutes of adaptation.
The architects, that will preserve the cast iron structures and the central nucleus, will place a deep well designed for sea animals. The huge enclosure sheltering animals , proposes a simple run to follow, organized on the themes of the life’s diversity (level 0 and 1), of the man as a factor of evolution (intermediary balcony - level 2), and of the life’s evolution (upper balcony - level 3). The old birds gallery, that has preserved its originally wood manufacturing, houses today 120 samples of threatened or disappeared species. Ancestor of the scientific garden imagined by Henry IV, the work was created in 1626 by two physicians of Luigi XIII. The collections of the museum won't stop growing, particularly thanks to the naturalists travellers that will bring specimens from all over the world. Among 1739 and 1788 The intendant of the king’s garden will contribute actively to the enrichment of its legacy and to the production of a species’ classification. On 10 June 1793 the convention will turn the king’s garden into the national museum of natural history. In 1872 a new zoological gallery was constructed with the support of Adolphe Thiersin in order to protect the accumulated wealth.