Bolder snails grow stronger shells
Predator-resistant bodies may be genetically programmed, study suggests
![Radix balthica snail](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/04/ay_snail_main_free.jpg?fit=860%2C460&ssl=1)
TOUGH STUFF Radix balthica snails can behave boldly or shyly when spooked. An individual snail's behavior appears to be linked with the strength of its shell.
Dr. Roy Anderson (CC BY-NC-ND 3.0)