25. Colossal Squid
If you ever see a colossal squid, you’re probably in big trouble because they’re highly aggressive and that is terrifying, which got them a spot on this list. The colossal squid has only been observed by humans a few times, usually when they wash up on shore or when scientists catch one from the deep. Research suggests that giant squid can reach up to 14 meters and their limbs are lined with sharp hooks and suction cups that are impossible to escape from. Little is known about the species, due to how deep they live throughout the Southern Ocean.