Sea urchin video

This is a video about a sea urchin, filmed in Grevelingen lake in the Netherlands.

This specimen is a green sea urchin. Not poisonous, unlike some of its relatives in the Mediterranean.

Jos van Zijl made the video.

Texel Cretaceous sea urchins: here.

Through their grazing activity, sea urchins excavate rock and form the pits they occupy. This activity may cause significant bioerosion of temperate reefs, according to a study published Feb. 21, 2018 in the open-access journal PLOS ONE by Michael Russell from Villanova University, US, and colleagues: here.