Starfish

Any marine invertebrate of the class Asteroidea (phylum Echinodermata) with rays, or arms, around an unclear central disc is known as a sea star. They are not fish, despite their former common name. The estimated 1,600 live species of sea stars can be found in all oceans, with the highest diversity in the northern Pacific. The majority of species are 20 to 30 cm (8 to 12 inches) across; but, some are as little as 1 cm (0.4 inch) and others as large as 65 cm (25 inches).Sea star arms are hollow and covered with small spines and pedicellariae (pincerlike organs) like the disc; on the lower side are grooves with rows of sucker-tipped or pointed tube feet (see video of tube foot anatomy and physiology). One or more of a sea star's arms can be lost and replaced. It can move in any direction and stick to steep surfaces thanks to its tube feet.

         

  

Whale

 Any of the bigger species of aquatic animals that belong to the Cetacea order. The name whale can refer to any cetacean, including porpoises and dolphins, but it is most commonly given to those that are longer than 3 metres (10 feet). The 2.7-metre tiny sperm whale (Kogia simus), which bears a striking likeness to its larger cousin, is an exception. Whales are the heaviest living or fossil creatures, with the blue whale (Balaenoptera musculus) reaching a maximum size of potentially more than 30 metres and 200 metric tonnes (220 short [US] tonnes.Except for the landlocked Caspian and Aral seas, whales can be found in all of the world's oceans and seas, from the Equator to the arctic ice. They are mammals with the following characteristics: they breathe air, are warm-blooded, give live birth, suckle their young with milk, and have hair. All are totally aquatic, with particular adaptations for living in water such as flippers and tail flukes. Whales must surface to breathe on a regular basis, allowing them to eject more air from their lungs than most mammals in an almost explosive breath known as a blow. The water vapor in the whale's hot breath condenses when the blow is released, making the blow visible.

              

Shark

Shark, any of the several predatory cartilaginous fish species that make up the order Selachii (class Chondrichthyes). Sharks, along with rays and skates, make up the Chondrichthyes subclass Elasmobranchii. Sharks, on the other hand, are distinguished from other elasmobranchs by their fusiform body shape and the placement of their gill clefts on each side of the skull. Sharks have thick skin that is drab grey in color and roughened by toothlike scales, though there are exceptions.A muscular, asymmetrical, upturned tail; pointed fins; and a pointed snout extending forward and over a crescentic mouth equipped with sharp triangular teeth are all common features. Sharks do not have a swim bladder, so they must swim constantly to avoid sinking to the bottom. According to various authorities, sharks are classified into 14–30 families, with over 400 species in existence. Humans are at risk from a number of larger animals. Sharks are fished commercially in large numbers. Overfishing in the late twentieth and early twenty-first centuries, on the other hand, drastically diminished the populations of some shark species.

      

Chameleon

 Any of a group of mostly arboreal (tree-dwelling) Old World lizards notable for their ability to alter body colour (family Chamaeleonidae). Chameleons also have zygodactylous feet (toes fused into opposing bundles of two and three), acrodont dentition (tooth attached to the edge of the jaw), independent eyes, atrophied venom glands that produce harmless trace amounts of venom, and a long, slender projectile tongue. The false chameleon, commonly known as an anole, is a New World lizard belonging to the genus Anolis (family Iguanidae).Bradypodion, Brookesia, Chamaeleo, and Rhampholeon are the four genera of real chameleons. Some researchers have identified two additional genera (Calumma and Furcifer).chameleon, Any member of the Chamaeleonidae family of predominantly tree-dwelling Old World lizards, distinguished primarily by its ability to change body colour. Toes fused into opposite bundles of two and three, teeth linked to the jaw edge, glands secreting a weak, harmless venom, and a long, slender, extensile tongue are among the other characteristics. About half of the 150 species are unique to Madagascar; the rest are primarily found in Sub-Saharan Africa with a few exceptions. The majority of them are 7–10 in. (17–25 cm) length and have a flattened body from side to side. The bulged eyes move on their own. Each species can go through a specific range of colour changes. The major food source is insects, but larger species also eat birds.

          

Crocodiles

Crocodile, (order Crocodylia, or Crocodilia), any of 23 species of lizard-like amphibious creatures with a carnivorous diet that belong to the reptile order Crocodylia. Crocodiles have short legs with clawed webbed toes and formidable jaws with numerous conical teeth. They all have a distinctive body shape that allows the animal's eyes, ears, and nostrils to be visible above the water's surface while the rest of the body is submerged. The skin is thick and plated, and the tail is lengthy and huge.Crocodiles are the closest living cousins of birds and represent a live link to the dinosaur-like reptiles of past periods. A wide range of crocodilian fossils dating back 200 million years to the Late Triassic Epoch have been unearthed. Three significant radiations appear to have occurred, according to fossil data. Only one of the four crocodile suborders has survived to the present day. Crocodiles, alligators, caimans, and gavials are all members of the Crocodylia order.

         

 

Tortoise

Any member of the turtle family Testudinidae is known as a tortoise. Previously, any terrestrial turtle was called a tortoise. All testudinids have elephantine (or cylindrical) hind limbs and hind feet, with two or fewer phalanges in each digit in their forefeet and hind feet. The shell of most tortoises is high domed, with the exception of the pancake tortoise (Malacochersus tornieri). Some species' shells have a flattened base and are nearly spherical.Tortoises are only found on land, and they can be found on all continents except Australia and Antarctica. They also live on many islands, though many island populations and species have been extinct as a result of human settlement. Living tortoises are classified into at least 15 genera, with one of them, Geochelone, ranging from South America to Africa and Asia.Tortoises come in a variety of sizes, from the small padlopers (Homopus) of southern Africa with shell lengths of 10 to 15 cm (4 to 6 inches) to the giant tortoises (Geochelone) of the Aldabra and Galapagos islands with shells exceeding 1 metre (3.3 feet). Tortoises can be found in a wide range of environments, from deserts to humid tropical rainforest. The majority of tortoises are vegetarians who eat leaves, flowers, and fruits; however, some tortoise species that live in moist woodland settings are more opportunistic and eat animal stuff.

 

                 

                                     

Tiger

 The tiger (Panthera tigris), the largest member of the cat family (Felidae), is only surpassed in size and ferocity by the lion (Panthera leo). The tiger is endangered across its range, which runs from the Russian Far East to the Indonesian island of Sumatra via North Korea, China, India, and Southeast Asia. The Siberian, or Amur, tiger (P. tigris altaica) is the largest, with a total length of up to 4 metres (13 feet) and a weight of up to 300 kilogrammes (660 pounds).The Indian tiger (P. tigris tigris), sometimes known as the Bengal tiger, is the most common, accounting for around half of the total tiger population. Males are larger than females, with a shoulder height of about 1 metre and a length of about 2.2 metres (excluding a tail of about 1 metre); weight is 160–230 kg (350–500 pounds); and southern tigers are smaller than northern tigers.Tigers in the Indo-Chinese (P. tigris corbetti) and Sumatran (P. tigris sumatrae) subspecies are vivid reddish tan with dark, almost black vertical stripes. The underbelly, inner sides of the limbs, cheeks, and a huge area over each eye are all white. Longer, softer, and whiter fur distinguishes the rare Siberian tiger. White tigers have been spotted on occasion, though not all of them are actual albinos, practically all of them in India (see also albinism).