I caught a black widow when I was young, and kept her in a big jar. I put some small branches, rocks, and other items in it for her habitat. I would
feed her different insects and moths, and it was fascinating to watch her stalk her entangled prey, pounce upon it, and wrap it up in silk. She was huge, and at a certain point created a fittingly large egg sac. I had a dream that the sac hatched, and hundreds of tiny, transparent, baby spiders swarmed out through the air holes in the lid and into my living space. I returned her and her future brood to the great outdoors the next day.. haha! Thanks for the memories, and best wishes to you and your stowaway.