The behaviour of the sea cucumber in the experimental beakers. The first few seconds show that the sea cucumber is not on the bottom of the beaker. After that, the arrow refers to suspended particles captured by the tentacles, and the sea cucumber pushing it into the mouth.
Mohamed Mohsen, Libin Zhang, Lina Sun, Chenggang Lin, Shilin Liu, Qing Wang, and Hongsheng Yang
Journal of Experimental Biology
2020. 223:None-None; doi: 10.1242/jeb.230508