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How to keep a pet praying mantis without a cage
Buy a potted plant.
Since mantises might cannibalize each other, purchase a plant for each one that you intend to keep. Pick a tall plant so they have plenty of room to climb.
Stick to a small pot, however, so they can find their food at the base more easily. Choose a plant with plentiful wide leaves so the mantis has adequate shade to escape the sun.