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How to have a black widow as a pet
Find a container that is impossible to escape from.
Tea jars, jam jars, and any other jars are great because the lid is screwed on, and no spider can escape from that unless they've been working out.
Put a little vaseline or something slippery around the top ring of the jar.
This will prevent your widow from trying to climb out. Before you go catching your spider, you may want to research if it is legal in the area you are in.