Three Cheers for Hermit Crabs!
Edmond is cheering for hermit crabs today! Come learn more about these little crustaceans!
H is for Hiding!
Hermit crabs hide in the shells of other animals.
E is for empty! Hermit crabs use the empty shells of gastropods to protect their bodies. When they grow, they must find a larger shell.
R is for respiration! Hermit crabs use gills to breathe!
M is for many species! There are around 1100 species of hermit crabs on earth.
I is for invertebrates! Hermit crabs have no backbones!
T is for terrestrial! Some hermit crabs live on land! While some live in water!
C is for Coconut! The largest terrestrial invertebrate is a hermit crab- the coconut crab!
R is roommates! Some hermit crabs put anemones on their shells for camouflage and protection.
A is for antennae. Hermit crabs have antennae on their head for feeling and sensing their environment.
B is for back in the day. Hermit crabs have been around since the Late Cretaceous period!
The Adventures of Ellie and Edmond 
I would think the would be around for a long time, they see very adaptable if they use others shells to live.