Nature provides a considerable number of good examples for simple and very efficient joint assemblies. One example is the enormously flexible cervical spine of American barn owls. which consists of 14 cervical vertebrae. Each pair of vertebrae produces a comparatively small individual movement in order to provide a large overall movement of the entire cervical spine. https://www.markbroyard.com/special-deal-sally-hansen-insta-dri-midnight-drive-supply-super-offer/