This November 2016 video, in English from the Netherlands, says about itself (translated):
Along with several international zoos ARTIS tries to save three tree snail species. The Insectarium of ARTIS has arranged a special breeding facility since December 2015 for reproduction of three tree snail species. In less than a year in ARTIS over 200 Polynesian tree snails grew up. In November this year, an ARTIS caretaker flew with 877 snails from various zoos to Tahiti. Small as they are, the snails play an important role in the ecosystem, biodiversity and cultural history of Tahiti. Read more here.