Here are the possible solutions for they have shells clue
Answer
Clue
Relevancy
casings
Clue
Shells of shells
Definition
CASING, a protective outer covering
pies
Clue
They have edible shells
They have shells
Definition
PIE, to mix printing type indiscriminately, also PI, PYE
tacos
Clue
They have edible shells
They may have soft shells
newt
Clue
Gingrich who said "females have biological problems staying in a ditch for thirty days because they get infections and they don't have upper body strength"
Definition
a tailed amphibian of the salamander family, also EWT
oars
Clue
They move shells
They're often put into shells
Definition
OAR, to propel a boat with long, broad-bladed poles
