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1. French Polynesia

Partula snails are making a comeback, after the largest-ever release of any “extinct in the wild” species.

Partulids eat decaying plants and fungi, making them an important part of the forest ecosystem. As separate species are endemic to single islands, their shells have played a significant role in local cultures.

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The snails were nearly wiped out by the rosy wolf snail, which was introduced to the islands to eliminate the invasive African giant land snail. The few surviving partulids were rescued in the early 1990s, when zoos in Europe and the United States collaborated to breed 11 different species of the gastropods.

J.B. Forbes/St. Louis Post-Dispatch/AP/File

A volunteer counts Partula nodosa snails raised at the St. Louis Zoo’s insectarium, November 2016.

Scientists began reintroducing the snails nine years ago to predator-proof reserves on the islands of Moorea and Tahiti. Since then, 21,000 snails have been delivered to the islands – 5,000 of them this year.

Paul Pearce-Kelly, who coordinates the conservation program, said the snails are “the Darwin’s finches of the snail world, having been researched for more than a century due to their isolated habitat providing the perfect conditions to study evolution. This collaborative conservation initiative … shows the conservation power of zoos to reverse biodiversity loss.”
Sources: The Guardian, IUCN Red List, Zoological Society of London

2. Canada

Engineers designed a powerful nanogenerator that harnesses vibration, using the same phenomenon that lights a gas stove and keeps a quartz watch accurate. The thin, 2.5-square-centimeter example of energy harvesting could be used to self-power electronics like internet-connected thermostats.

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