Box turtles are so-called because they can completely close up their shell, much like a box.

There is a 'hinge' located on the plastron, or the lower part of the shell, that allows for total closure

📹 madbioreptiles

https://t.co/jyP2P1Q2sP https://video.twimg.com/amplify_video/1769917844030971904/vid/avc1/720x1280/LCcfBUh5pr4ti10r.mp4?tag=14