To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 4 Trenches frequently start as a pit. Time-lapse video from which the pictures of Fig 2B were taken. The original movie can be viewed by downloading the file via the link below. Time-lapse reveals that osteoclasts can move across the bone surface while resorbing Kent Søe, and Jean-Marie Delaissé J Cell Sci 2017. 130:2026-2035; doi: 10.1242/jcs.202036 Download Original Video