Magical colour changing Snegals in catch jars

Conceived by my daughter, Lucinda, when she was 11 years old.
These snegals have their own homes. Each jar contains exactly what a snegal needs to stay perfectly happy and safe.
Snegals are magical colour changing snails that change through a full spectrum of iridescent colours depending on the ambient temperature.
There are 3 main species of snegal;
Skinny
Plump
Twisty
Availability is dependent on season