To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3 A 3D reconstruction of the endoskeleton (‘test’) of the sea urchin Diadema africanum. Imaging of a whole test was carried out at 46.5 μm using μCT with a Zeiss Xradia XRM520. The sea urchin Diadema africanum uses low resolution vision to find shelter and deter enemies John D. Kirwan, Michael J. Bok, Jochen Smolka, James J. Foster, José Carlos Hernández, and Dan-Eric Nilsson Journal of Experimental Biology 2018. 221:None-None; doi: 10.1242/jeb.176271 Download Original Video