Because of the high mobility, they really only do well in very tall cages, larger and more expensive than most people find desirable. (petbusiness.com)
To test the idea, the researchers did an experiment where they let two species of North American black widows build webs in 20 - inch - tall cages in the lab over the course of three days. (sciencedaily.com)
Note that canaries and finches prefer a cage that's wider than it is taller, while parakeets and cockatiels like tall cages with horizontal bars they can climb. (metrodetroitanimals.org)