I think I've seen similar videos of sculpins doing this - who have a suctiony fused set of bottom fins. If sculpins do it, probably some kind of Goby also does

I think I've seen similar videos of sculpins doing this - who have a suctiony fused set of bottom fins. If sculpins do it, probably some kind of Goby also does it (the two families are very similar in many ways). ETA: I have it backwards, it's gobies: https://youtu.be/QYMMf18hZCs https://youtu.be/QYMMf18hZCs Also Cavefish: https://www.theverge.com/2016/3/25/11303774/walking-fish-thailand-cavefish-evolution-study-njit https://www.theverge.com/2016/3/25/11303774/walking-fish-tha... And yes - as people point out, sea lampreys can do this with their sucky mouths. With with the variety of small fish with sucky mouths, probably there's even more who have learned this trick. Nature is amazing.