MANILA — In 2017, a group of researchers surveying mollusks in a popular ecotourism site east of the Philippine capital stumbled upon a tiny land snail with a unique “upside down shell.”
It was a microsnail, its shell just about the size of an ant, and it was found crawling along the jagged limestone boulders of Masungi Georeserve, looking for lichens and other vegetation to feed on. While the snail carries its shell in a typical position when it moves, with the pointed whorl at the top, when resting in crevices it moves its shell so that the whorl is underneath.
https://news.mongabay.com/2020/12/new-snail-subspecies-with-upside-down-shell-found-in-last-green-frontier-east-of-manila/
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