sentences:  Zoos do not only keep such species in their custody with a view to maintaining ex situ reserve populations, but they increasingly link their ex situ activities with conservation projects in the field (“in situ”).With the human population worldwide constantly increasing together with an ever increase in demand for resources, and destruction of natural habitats, the role of zoos as conservation centres and arks will become even more important in the coming years, combined with accumulating experience and knowledge on ex-situ and in-situ conservation by the worldwide zoo community, which is increasingly committed to integrated conservation.Members of the World Association of Zoos and Aquariums and the wider WAZA Network undertake or support thousands of "in situ", or combined "ex situ"-"in situ" projects.