The zoo said the International Partula Conservation Programme planned to release the snails into reserves on the islands later this year.
Aid sent so far - including boats, mobile phones and night vision binoculars - has been provided by the WWF's Tiger Conservation Programme.
The zoo hopes it can breed the snails, which give birth to one baby every three months, so they can be reintroduced to the wild as part of a conservation programme.
"The estimated mortality comes to more than 30 animals per year, and having a population that is only 150 - you can imagine that the population will not survive if nothing is done, " said Lorenzo Rojas-Bracho, Mexico's IWC commissioner and the head of the national marine mammal research and conservation programme.
This allows producers in these areas to apply for low-interest loans from the government, and opens up land in the conservation reserve programme for use for grazing and hay production.
Due to its inaccessibility, only about 1, 500 people a year make the sea voyage to St Kilda, with many of these taking part in working holidays as part of the trust's conservation volunteer programme.
The colloquium will also provide a platform for presenting the achievements that have been made in earthen architecture conservation through the WHEAP Programme.
UNESCO: Detailview | United Nations Educational, Scientific and Cultural Organization
The colloquium will also provide a platform for presenting the achievements that have been made in earthen architecture conservation through the WHEAP Programme (2007-2017).
UNESCO: Detailview | United Nations Educational, Scientific and Cultural Organization
Jean-Christophe Vie, deputy director of the International Union for Conservation of Nature species programme, disagrees with the review's conclusion that "species are more likely to be described than become extinct".
New facilities are being built, including a visitor centre with state-of-the-art interpretation of the battle and a programme of conservation, restoration and enhancement of the commemorative park and its flagpole, Bruce statue and Rotunda monuments.
The warning comes in a report prepared by TRAFFIC, the wildlife trade monitoring programme of IUCN-The World Conservation Union and WWF, the global environment campaign.
The new programme can also provide funding for the conservation of war memorials.
One of the key elements of the new Jurassic Coast World Heritage Site management plan is an education programme that actively engages young people in the conservation and interpretation of the Site.
Cathy Rose, of the Chilterns Conservation Board, told BBC Radio 4's Today programme that rabbits, guinea pigs and smaller birds could be next on the menu if the public keep feeding the predatory birds.
She hopes that funds raised through the Shepreth Wildlife Conservation Charity will enable the park to continue with its hedgehog rehabilitation programme, which it has managed for 25 years.
UNESCO, as part of the World Heritage Earthen Architecture Programme (WHEAP), is organizing an International Colloquium on Conservation of World Heritage Earthen Architecture.
UNESCO: Detailview | United Nations Educational, Scientific and Cultural Organization
In light of 2010 government cut backs, English Heritage prioritised its planning advice services, the maintenance and conservation of its properties, existing grant commitments and its Buildings at Risk programme.
The park contributes to conservation projects working with endangered species throughout the world and has managed a hedgehog rehabilitation programme for 25 years.
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