Swimming in an open sea or hiking in a deep forest on a vacation can be fun and exciting especially when you have a chance to visit Australia. Australia is home to vast biodiversity. It is a unique country for those who want adventure and to encounter different cultures, traditions, and of course, animals. About six million visitors come to Australia each year because of its beautiful beaches, unique flora and fauna, friendly and hospitable people, and relaxed atmosphere. Australia has some 9,700 protected nature areas such as national parks and can offer visitors a varried and diverse array of nature-based tourism opportunities. This country is home to more than one million species of plants and animals, many of which are unique. Australia is a “megadiverse” country, and is one of the most biologically rich countries in the world. There are 17 megadiverse countries, comprising a mere 10 percent of the earth's surface, but together accounting for more than 70 percent of its biodiversity. Australian biodiversity has been influenced by the range of environmental conditions in the country. Australia has diverse bodies of water and land which are home to a wide range of species of animals you can only find in the country. One of those is the Australian box jellyfish. The Australian box jellyfish is considered the most venomous marine animal and despite their gentle physical characteristics, they are considered one of the most dangerous species of jellyfishes. Box jellyfish are identified and distinguished by their box-like body. Some species of box jellyfish like the one in Australia produce potent venom delivered by contact with their long tentacles. Unlike other stings from other species, their venom can be fatal to humans. Its name was obviously derived from its physical characteristics and unlike other species, with the help of their form, box jellyfish can move more rapidly. They can swim up to a speed of  6 meters per minute. Its bell or head usually reaches about 6.3 inches (16 cm) in diameter but can grow up to 13.8 inches (35 cm). From each of the four corners of the bell trails a cluster of approximately 15 tentacles where venom can be found. The pale blue bell has faint markings or patterns when viewed from certain angles. If you look closely at its head, you’ll notice its resemblance to a human head or skull which makes it look scarier. Due to its almost transparent color, the creature is nearly impossible to notice in its habitat which makes it more dangerous as you cannot easily avoid contact. When the jellyfish are swimming or floating on the water, their tentacles contract so they are only about 6 inches (15 cm) long and only about 0.2 inches (5 mm) in diameter. But when they are hunting, their tentacles become thinner and extend up to about 10 feet (3 m) long. Their tentacles are covered with a high concentration of stinging cells called cnidocytes, also known as stinging cells. They are specialized cells that contain an “explosive” organelle called cnidocyst that acts as a 600 million-year-old microscopic injection system and is important for prey capture and anti-predator defense. Common to species in the diverse phylum Cnidaria, these cells can launch a toxic barb or blob to enable cnidarians to stun prey or deter invaders. Box jellyfish are active hunters during the day time; while at night, they are seen resting on the ocean floor. Australian box jellyfish have four eye-clusters with 24 eyes. Some of these eyes are quite sophisticate. They have a lens and cornea, and an iris that can contract in bright light, and a retina. Their speed and vision lead some researchers to believe that box jellyfish actively hunt their prey, mainly shrimp and small fish. Although all box jellyfish contain venom and are considered terrors of the sea, they are not dangerous to consume for some marine predators like green sea turtles which are the main predators of box jellyfish. Aside from green sea turtles, other predators are ocean sunfish, gray triggerfish, seabirds, whale sharks, some crabs, and some whales such as humpbacks. They are attracted to light of different colors but blue light seems to elicit a feeding behavior. Interestingly, black objects seem to cause them to move away. They can actually see images, with the aid of light-focusing lenses. A researcher named Anders Garm from the University of Copenhagen has found that the jellyfish always keeps its upper lens eyes pointing towards the sky. They live on a diet of prawns and small fish and are prey to turtles, whose thick skin is impenetrable to the cnidocytes of the jellyfish. Box jellyfish have tentacles covered in biological booby traps known as nematocysts - tiny darts loaded with poison. People and animals injected with this poison may experience symptoms such as paralysis, cardiac arrest, and even death, all within a few minutes of being stung. Although jellyfish can be found in many seas and oceans, box jellyfish can be commonly