The Mediterranean House Gecko is a small reptile that has gained widespread distribution outside its native territory in Southern Europe, North Africa, and parts of the Middle East. They have adapted to human settlements, including residential areas. 

Their light skin can change color to blend in with their surroundings, and their bodies are covered in small bumps. Likewise, their unique toe pads allow them to climb walls and ceilings, making them efficient hunters. 

These geckos are nocturnal, hunting insects and spiders for their diet. The Mediterranean House Gecko also helps control pest populations in residential areas.

The Satanic Leaf-tailed Gecko is a nocturnal species found in Madagascar's central and northern rainforests. It blends in with its environment through camouflage. The gecko looks like dead leaves with its body shape and coloration, and its tail mimics fallen foliage. 

By day, the gecko uses its exceptional camouflage to avoid predators. At the same time, at night, it becomes a silent predator, preying on small invertebrates and insects.

The horn-like projections above its eyes, which give the gecko its name, add to the illusion. Despite its name, the Satanic Leaf-tailed Gecko is not harmful to humans. 

However, this type of gecko faces threats such as habitat destruction due to deforestation and the illegal pet trade. The gecko's unique appearance makes it a desirable target in the pet trade.

The Fan-Fingered Gecko is a nocturnal creature found in the rocky landscapes of North Africa and the Middle East. Its unique fan-shaped digits allow it to climb rocky cliffs easily, and its earthy brown coloration provides effective camouflage against the stony background. 

The Fan-Fingered Gecko begins its foraging routine every night under the vast desert sky. Despite its small size, it is an adept hunter, preying on beetles, spiders, and moths. 

It emits a high-pitched sound to defend itself. Moreover, it can drop its tail to escape when threatened; afterward, it grows a new one.

The Common House Gecko is a nocturnal Southeast Asian reptile. These geckos have semi-transparent skin; their internal organs are visible through their skin. Their size ranges from 4 to 6 inches, with males slightly larger than females. 

These nocturnals communicate with chirps and clicks. They are also not picky eaters, feeding on insects, small invertebrates, their shed skin, and unfertilized eggs. They help balance the ecosystem by checking mosquitoes, spiders, and other unwanted bugs.

The White-Lined Gecko is a distinctive species inhabiting the rainforests of Southeast Asia. It has a white stripe running along its body, which has earned it the nickname of Skunk Gecko. 

The gecko can change its color from light to dark, blending in with its surroundings and avoiding predators. With sticky toe pads, it can easily climb vertical terrains.

This solitary creature mainly feeds on insects like crickets and roaches. Occasionally, it may prey on small lizards. 

Likewise, the White-Lined Gecko emits a high-pitched squeak when threatened. During the breeding season, male geckos may become aggressive.

The Mourning Gecko originates from the Indo-Pacific region. It also emits a unique 'mourning' call, a series of soft, sorrowful chirps. This type of gecko can thrive in different parts of the world. 

These geckos are small, with an average size of around 4 inches, but they can live up to ten years in captivity with proper care. Their diet consists of sweet, juicy fruits, crunchy insects, and their shed skin!

It is most active at night when it hunts for food. Notably, the Mourning Gecko is parthenogenetic, which means that females can produce offspring without a male.

The New Caledonian Giant Gecko is the largest gecko species on the planet, with adults reaching up to 17 inches in length. These types of geckos have robust bodies and large heads, with unique granular skin covering them. 

Their color palette ranges from greens to browns, often decorated with patterns of varying shades, enabling them to blend into tree bark and foliage.

This type of gecko is a nocturnal predator that feeds on insects, fruits, and small mammals, occasionally indulging in cannibalism. 

They also communicate through growling, barking, and hissing, which are crucial, especially during the mating season.

The Nile crocodile, stretching up to 16 feet long, is the second-largest crocodilian and the largest in Africa. Predominantly, the males reach this size; females remain somewhat smaller. Their bodies, cloaked in a dark bronze shell dotted with black and a hint of belly purple, make a perfect camouflage for preying. 

This crocodile boasts an impressively strong bite force, almost 3,000 PSI, one of the highest among animals. They inhabit the freshwater venues of Sub-Saharan Africa, the Nile Basin, and even Madagascar. These habitats provide an ideal mix of protective cover and bountiful food resources. 

Contrary to common belief, Nile crocodiles are not solitary by nature. They have a social structure, showcasing dominance and sometimes even disputes. 

They also have a sharp sensory system. This crocodile can sense minute changes in water pressure, which is vital for hunting.

The American crocodile reaches a hearty 13.5 feet in length, sporting broad snouts studded with sharp teeth for grappling prey. 

They are the only crocodile species native to the US, primarily seen in southern Florida and at times sighted in Louisiana and Texas. Their olive-gray hue provides excellent camouflage in their surroundings, hiding them from prey until the ideal strike moment.

Because of their adaptability, these crocs are the most widespread of all species living in America. They can survive in fresh wetlands, coastal lagoons, and river estuaries and even handle saltwater, courtesy of special glands that filter out excess salt. Other types of crocodiles may have tolerance to salt. Still, only the American crocodile4, other than Saltwater Crocodiles, can thrive in saltwater environments.

Despite their formidable presence and efficient predation, they tend to be reserved and mainly avoid humans. Males are territorial, and despite their solitary life, they contribute significantly to the ecosystem by keeping prey populations in check.

The Freshwater Crocodile can be found in Northern Australia. This species is also Johnston's Crocodile, commemorating the amateur naturalist Robert Arthur Johnstone, who first reported it. 

They have light brown bodies with darker bands at the back and tail. Males typically measure up to 9 feet, while females average around 7 feet. Their narrow snouts, distinguishing them from other crocs, are ideal for catching fish, insects, and small amphibians.

These freshwater crocodiles inhabit rivers, wetlands, and creeks, living away from Saltwater Crocodiles as much as possible to avoid confrontation.