Starfish are one of the most recognizable icons of marine life. Unlike what their names would suggest, they are echinoderms and not fish – they do not have gills, scales, fins or even blood. These animals move using a complicated system on their underside. Sea water is used to suck onto surfaces, through the multitudes of tube feet which look a little bit like alien tentacles. These tube feet also help them latch onto their prey, while it pushes its stomach through its mouth to feed itself. Yep, definitely some mad alien skills here.