An extraordinary scientific discovery has come from the markets of Laos, where an animal being sold as food turned out to be a species thought to have been extinct for about 11 million years. This is the "Laonastes aenigmamus," known as the rock mouse, which was first observed in 1996 by biologist Robert Timmins in a market in the city of Thakhek.
Initially, it was thought to be a new species, unknown to science. However, after further studies, including analyses at the Natural History Museum, scientists discovered that this rodent had characteristics very different from all others. Comparisons with ancient fossils from Asia showed that it belonged to the Diatomyidae family, which was believed to have gone extinct millions of years ago.
Rather than being a new species, it turned out to be the sole surviving representative of a very ancient evolutionary lineage. This case is a clear example of the "Lazarus Effect," which describes the return of a species considered extinct after a very long absence in the fossil record.
The discovery was published in 2006 in the journal "Science" and was considered one of the rarest cases of this phenomenon among mammals. Laonastes aenigmamus has a unique appearance, between a mouse and a squirrel, and moves in a peculiar way, swaying like a duck. It lives mainly in rocky areas and prefers to move among stones rather than climbing trees. Its discovery was a great surprise, confirming that in the most unusual places, secrets that change the history of evolution may be hidden.