Researchers at MIT and other universities have found that spider silk produces a strong twisting motion when exposed to humidity, and may be usable for future artificial muscles or actuators.
Spider silk could be used as robotic muscle, MIT News
Artificial muscles based on MIT fibers could make robots more responsive
Researchers design the building blocks of synthetic muscle using computational method
Spider silk could be used as robotic muscle, MIT News
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What Makes Spider Silk so Special, and How Science Can Learn From It
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Unique Spider Silk Property Discovered Has Potential for Smart Textiles, Artificial Muscles - Research & Development World
Spider Silk Could One Day Be Used to Make Artificial Robotic Muscles - TechEBlog
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Mix-and-match kit could enable astronauts to build a menagerie of lunar exploration bots, MIT News
Spider silk could be used as robotic muscle: Study- The New Indian Express