How snails breathe through snorkels on land
Shells with a tube counterintuitively sealed at the top have overlooked powers
![shells of Alycaeus conformis snail](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/07/ticker_snailsnorkel_free.jpg?fit=860%2C460&ssl=1)
COUNTERINTUITIVE SNORKELS Little tubes (arrows) following the crease between whorls let these small Asian Alycaeus snails breathe when hiding in their shells — even though tube ends are sealed.
B. Páll-Gergely