Cages

He opened the cages.

Some animals will not breed when kept in cages.

The lions roared in their cages.

Unbeknownst to him, at the space hotel, there was a musically complimented Mexican restaurant surrounded by gigantic cages full of tropical parrots and other birds.

The animals are kept in very small cages.

These birds seem to have been in there for quite some time. Some have even scratched obscene graffiti into their cages' bottoms.

Aviaries are sometimes called flight cages because the birds confined therein have room to fly around.

Monkeys are kept in cages.

You have opened the cages.

You opened the cages.