Black Caiman. While most captive specimens will be about 12 to 14 feet, the largest verified individual measured 32 feet 9 inches long. We are detailing the names of 10 such rarest snakes in the world. Ironically, most domesticated snakes who have caused harm are results of improper care. The first snake in the top ten is a special one. Although most snakes, turtles, lizards and other reptiles typically pose little threat to humans, some can be numbered among the deadliest creatures on the planet. The World's Top 10 Most Dangerous Animals. The Round Island keel-scaled boa can change colour over a 24-hour period, and is also the only vertebrate with a joint in its upper jaw, used to capture and eat its lizard prey.This species is found on only one small island off the coast of Mauritius. If you are a long time reader of Listverse you will remember that we have previously had two lists on snakes: 10 lesser known venomous snakes and 10 unusual and amazing snakes.Surprisingly, we have not published a list of the most venomous snakes – and so, today, we fill that void with the following list. Aruba Island Rattle Snake: Crotalus Unicolor or Aruba Island Rattle snake is an endangered rattlesnake species. From birds to invertebrates, the populations of many of the continent's greatest treasures are teetering on the brink. 2. Read more: Top 10 Fierce Animals In The World. If you are a long time reader of Listverse you will remember that we have previously had two lists on snakes: 10 lesser known venomous snakes and 10 unusual and amazing snakes.Surprisingly, we have not published a list of the most venomous snakes – and so, today, we fill that void with the following list. You see, snakes are not meant to be kept in captivity even if they do tend to live longer than those in the wild. Although most snakes, turtles, lizards and other reptiles typically pose little threat to humans, some can be numbered among the deadliest creatures on the planet. It is mainly found in the Caribbean Island of Aruba, located just off the coast of Venezuela. ... Top 10 Animals With Strange Behavior. Here is a list of the most dangerous snakes in the world Habitat destruction is one of the factors affecting the endangered animals of North America. And they also have the right to live with ease. They are fast; they are dangerous; they are venomous. Its size is medium and around 4-5 feet long but unfortunately critically endangered species now. ... Because of depleting rainforest Poison Dart Frogs are at risk and the Blue Poison Dart Frog is the most endangered due to the pet-shop market. Some snakes are dangerous because of the speed or ferocity of their attacks, others because of how common and widespread they are, and still others because their toxins are so deadly. Also known as Loxosceles laeta, this spider can be deadly depending on its size and the size of the victim.If it isn't sufficient enough to kill, the venom of this recluse spider acts by dissolving the tissues of the skin and it causes cells to die, resulting in amputation.