
Cage
Literal Use
Use 'cage' to refer to physical enclosures with bars; specifically for confining animals.

The zoo installed new cages for the monkeys.
Negative Feelings
A cage usually implies captivity and lack of freedom, which can evoke sympathy for caged animals.

Seeing birds in a tiny cage makes me sad.
Material Notice
Cages are often made of metal, but you might find wooden or plastic ones for smaller pets.

She bought a wooden cage for her parrot.
Compare with
CellContainerCoopCrateEnclosureHutchPenTrap
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