Snailicorns are large snail-like creatures that have the characteristics of a unicorn such as a large horn, hence to the name, which is a portmanteau of snail and unicorn. They only appear in New Super Mario Bros.and are never seen outside of ice stages. They are dangerous as a jump-on or ground-pound is not enough to defeat them, and Fireballs are ineffective. However, as jumping on them sends them back a few feet, this tactic can be used to send them of a cliff nearby, but respawn if Mario leaves the area and comes back, a full-speed Shell Mario or a stray shell will knock them out. They only appear in World 5-3 and World 5-B.