Shells of snails were first CT scanned then 3D printed to create artificial shelters that vary in highly precise ways. 3D printed shell (left) and real shell (right). Disclaimer: AAAS and EurekAlert!

Land hermit crabs have been using bottle tops, parts of old light bulbs and broken glass bottles, instead of shells. New research by Polish researchers studied 386 images of hermit crabs occupying ...