sentences:  In fact modern zoos consider themselves as centers for conservation of biodiversity through captive breeding programs ("ex-situ" conservation) in particular of threatened species as well as various "in-situ" conservation programs, such as reintroduction and restocking projects, supporting in-situ conservation projects (protection of species and/or their habitat), transfer of knowledge and techniques, in situ educational programs aimed at the local people and at the politicians, biological programs (research and monitoring), socio-economic projects, social work among the local people, PR activities and much more on a national and international scale.Therefore, some zoos call themselves today "conservation parks" or "bioparks".In the world, zoos more and more see themselves as modern arks for endangered and rare species.