Since they are born anew, their bodies shrink and tentacles retract. The Ministry of Magic, which acts as a type of government for the wizarding world, lists each magical animal on a scale from one to five with X’s, with one being relatively harmless and five being incredibly dangerous. As we saw in my post “The Top 10 Fastest Animals in the Air” it is the fastest animal in the world and when you compare its top speed achieved by a human which was 44.72km/h (27.8 mph) by Usain Bolt it’s very fast indeed. But, do you know which is the second heaviest animal in the world? They appear in many myths around the world, and also in popular modern stories such as Harry Potter, The Hobbit or Game of Thrones.. The ¨immortal¨ jellyfish, Turritopsis nutricula, is considered to be one of the most incredible animals in the world.This jellyfish is to the Caribbean and does not measure more than a mere 5mm. If it sees death coming from an injury or a disease, it attaches itself to the ocean floor and transforms into a young polyp. Dragons are usually reptiles; although they vary in size and characteristics depending on their origin, they are certainly one of the most powerful legendary creatures. The toughness of animals depends on various factors including where they live and how they survive. As you know no other animals on earth are heavier than whales. With that in mind, here are the top 10 Harry Potter creatures. Dragons. Top 10 Bizarre Animals Live Forever That Are Secretly Immortal 11:44:00 AM Animals Edit ... the immortal jellyfish, has found a way to cheat death by actually reversing its aging process, according to National Geographic. There are Animals that never does. The tiny immortal jellyfish can be found in warm waters of the Mediterranean or the Caribbean Sea. Here are Top 10 Best Animals That Can Live Forever (Immortal Animals). Top 10 Best Animals That Can Live Forever (Immortal Animals) And what about the third one? This animal is considered to be immortal, defying the concept of death. 10. If you think lions and tigers are the toughest animals in the world, you are so wrong and in for a surprise when you read this article. Immortality – The Immortal Jellyfish Immortality – The Immortal Jellyfish. But what process converts this jellyfish into such an eternal species? From saltwater crocodiles to Honey Badgers, here is the top … Troll Well, here the list of 10 heaviest animals in the world.