Tuatara

                Tuatara is a reptile that is endemic to New Zealand which, though it resembles most lizards, is part of a distinct lineage, order Rhynchocephalia. The tuatara is considered the most unspecialised living amniote. The brain and mode of locomotion resemble those of amphibians and the heart is more primitive than that of any other reptile. Tuatara are greenish brown and gray, and measure up to 80 cm (31 in) from head to tail-tip and weigh up to 1.3 kg (2.9 lb) with a spiny crest along the back, especially pronounced in males. Their dentition, in which two rows of teeth in the upper jaw overlap one row on the lower jaw, is unique among living species. 
               Adult tuatara are terrestrial and nocturnal reptiles, though they will often bask in the sun to warm their bodies. Hatchlings hide under logs and stones, and are diurnal, likely because adults are cannibalistic. Tuatara thrive in temperatures much lower than those tolerated by most reptiles, and hibernate during winter. They remain active at temperatures as low as 5 °C (41 °F), while temperatures over 28 °C (82 °F) are generally fatal.

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Green Anaconda

                Green Anaconda (Eunectes murinus, water boa) is a nonvenomous boa species found in South America. It is the heaviest known snake species. The green anaconda is one of the world's longest snakes, reaching more than 6.6 m (22 ft) long. The longest (and heaviest) scientifically verified specimen was a female measuring 521 cm (17.09 ft) long and weighing 97.5 kg (215 lb). The color pattern consists of olive green background overlaid with black blotches along the length of the body.
                 The primarily nocturnal anaconda species tend to spend most of its life in or around water. Anacondas are also sometimes known as the water boa; they spend more time in water than any of the boas. Because of their large sizes, they seem rather slow and sluggish when traveling on land. They eat a wide variety of prey, almost anything they can manage to overpower, including fish, birds, a variety of mammals, and other reptiles.

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Chameleons

                Chameleons (Chamaeleonidae) are a distinctive and highly specialized clade of lizards. The approximately 160 species of chameleon come in a range of colors, including pink, blue, red, orange, turquoise, yellow, and green. They are distinguished by their zygodactylous feet; their separately mobile, stereoscopic eyes; their very long, highly modified, rapidly extrudable tongues; their swaying gait; and crests or horns on their distinctively shaped heads. Some species can change color, and many have a prehensile tail.   
                 Chameleons are classified in 2 subfamilies Brookesiinae and Chamaeleoninae. Brookesiinae include the following genera: Archaius, Bradypodion, Calumma, Chamaeleo, Furcifer, Kinyongia, Nadzikambia, Trioceros. Brookesiinae include the following genera: Brookesia, Rieppeleon, Rhampholeon.

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Nile crocodile

                Nile crocodile (Crocodylus niloticus) is an African crocodile. The Nile crocodile is the largest crocodilian in Africa and is sometimes regarded as the second-largest crocodilian after the saltwater crocodile. The male crocodile usually measure from 3.5 to 5 metres (11 to 16 ft) long, but very old, mature ones can grow to 5.5 m (18 ft) or more. Nile crocodiles have a dark bronze colouration above, with black spots on the back and a dirty purple on the belly. The flanks, which are yellowish-green in colour, have dark patches arranged in oblique stripes.
               Nile crocodiles prey on humans frequently, far more often than other crocodilian species. It is estimated that each year hundreds of people die from crocodile attacks in Africa – many of these attacks are never reported in the media.

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Leucistic Texas Rat Snake

                Leucistic Texas Rat Snake (Elaphe obsoleta lindheimeri) is a subspecies of rat snake, a nonvenomous colubrid found in the United States, primarily within the state of Texas, but its range extends into Louisiana, Arkansas and Oklahoma. It intergrades with other subspecies of Elaphe obsoleta, so exact range boundaries are impossible to distinguish.      
                 The Leucistic Texas rat snake has a voracious appetite, consuming large numbers of rodents and birds, and sometimes lizards and frogs which they subdue with constriction. They are generalists, found in a wide range of habitats from swamps, to forests to grasslands, even in urban areas.

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Galápagos tortoise

            The Galápagos tortoise or Galápagos giant tortoise (Chelonoidis nigra) is the largest living species of tortoise and 10th-heaviest living reptile, reaching weights of over 400 kg (880 lb) and lengths of over 1.8 meters (5.9 ft). With life spans in the wild of over 100 years, it is one of the longest-lived vertebrates. A captive individual lived at least 170 years. The longest living turtoise in the world was Adwaita (c. 1750 – 23 March 2006). 
             The largest recorded individuals have reached weights of over 400 kilograms (880 lb) and lengths of 1.87 meters (6.1 ft). Shell size and shape vary between populations. On islands with humid highlands, the tortoises are larger, with domed shells and short necks - on islands with dry lowlands, the tortoises are smaller, with "saddleback" shells and long necks. The tortoises are herbivores that consume a diet of cacti, grasses, leaves, lichens, and berries.

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Komodo dragon

             Komodo dragon (Varanus komodoensis) is a large species of lizard found in the Indonesian islands of Komodo, Rinca, Flores, Gili Motang and Padar. A member of the monitor lizard family (Varanidae), it is the largest living species of lizard, growing to a maximum length of 3 metres (10 ft) in rare cases and weighing up to around 150 kilograms (330 lb). 
              Komodo dragons are carnivores. Although they eat mostly carrion, they will also ambush live prey with a stealthy approach. When suitable prey arrives near a dragon's ambush site, it will suddenly charge at the animal and go for the underside or the throat. Komodo dragons have been observed knocking down large pigs and deer with their strong tails.

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Milk snake

                Milk snake (French: Couleuvre tachetée; Spanish: Culebra-real coralillo),(Lampropeltis triangulum), is a species of king snake. There are 24 subspecies of milk snakes. Lampropeltis elapsoides, the scarlet kingsnake, was formerly classified as the subspecies L. t. elapsoides, but is now recognized as a distinct species. Milk snakes grow 20 to 60 inches (51 to 150 cm) long. They have smooth and shiny scales and their typical color pattern is alternating bands of red-black-yellow or white-black-red. Young milk snakes typically eat slugs, insects, crickets, and earthworms. Adult diet frequently includes lizards (especially skinks), and small mammals. They are also known to eat birds and their eggs, frogs, fish, and other snakes.

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Saltwater crocodile

               Saltwater crocodile (Crocodylus porosus), also known as the estuarine or Indo-Pacific crocodile, is the largest of all living reptiles. This is a formidable, opportunistic and adaptable predator who has a considerable range. It is found in suitable habitats from Northern Australia through Southeast Asia to the eastern coast of India, historically ranging as far west as off the eastern coast of Africa and as far east as waters off of Japan.
               Newly hatched saltwater crocodiles measure about 25 to 30 centimetres (9.8–12 in) long and weigh an average of 70 grams (2.5 oz). By the time of their second year, a young crocodile will attain 1 metre (3.3 ft) and a weight of 2.5 kilograms (5.5 lb). Males reach sexual maturity at around 3.3 metres (11 ft) at around 16 years of age, while females reach sexual maturity at 2.1 metres (6.9 ft) and 12–14 years. An adult male saltwater crocodile's weight is 400 to 1,000 kilograms (880–2,200 lb) and length is normally 4.1 to 5.5 metres (13–18 ft). However, mature males can exceed 6 metres (20 ft) and weigh more than 1,000 kilograms (2,200 lb), and this species is the only extant crocodilian to regularly reach or exceed 4.8 metres (16 ft). Weight can vary enormously based upon the condition and age; older males tend to outweigh younger ones since they maintain prime territories with access to better, more abundant prey. For example, crocodiles at 4.8 metres (16 ft) long have ranged in mass variously from 522 kilograms (1,150 lb) to 1,000 kilograms (2,200 lb).

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