This video is called The Tale of the Partula Snail.
From Wildlife Extra:
Near extinct snails bred at ZSL London Zoo to be released back into the wild
Tiny endangered tree-snails to be reintroduced onto Tahiti
September 2013. Hundreds of tiny endangered tree-snails will be reintroduced to their former Polynesian home following the incredible success of an international breeding programme led by ZSL London Zoo.
30 year absence
Three species of Partula snail, Partula affinis, Partula nodosa, and Partula hyalina, which were bred at ZSL London Zoo and other partner zoos around the world, will be released on to the island of Tahiti in October after a nearly 30 year absence.
ZSL London Zoo invertebrate keeper and coordinator of the international Partula studbook, Don McFarlane, along with staff from Bristol and Edinburgh Zoos, will be escorting the precious cargo of snails to Tahiti, where they will be released into a protected reserve in their native forest habitat.
McFarlane said: “We’re incredibly proud of the role ZSL London Zoo has played in bringing these snails back from the brink of extinction and reintroducing them to their native Tahiti. There used to be more than 70 species of Partula tree snails across the Pacific French Polynesian islands, but due to man’s influence, most of these species are now endangered or extinct in the wild.
“This project is the result of almost 30 years of collaborative work between zoos around the world, and the French Polynesian Government. We’re really hopeful that the hard work will pay off and we’ll see Partula snails thriving in the wild once again.”
Driven to extinction by Wolf snail
Originating from the steep volcanic forested islands of French Polynesia, Partula snails provide valuable insights into the mechanisms of evolution. Populations of the snails were decimated after the predatory rosy wolf snail (Euglandina rosea) was introduced from Florida in the 1970s to rid the islands of a previously-introduced alien species – the African giant land snail – but the rapacious predator devoured the tiny native snails instead.
The Partula Global Species Management Programme is coordinated by ZSL London Zoo with St Louis Zoo, and combines the breeding programme for 16 species in 16 different zoos around the world with field conservation work in the Polynesian islands.
This video from the USA says about itself:
Extinct Snail and Its Baby!
4 feb 2011
The Partula snail is extinct in the wild. But a small population hangs on as part of a breeding program at Seattle’s Woodland Park Zoo. This short clip shows how the snail moves. A baby snail can be seen next to the adult.