The Marsh Crocodile, also known by the scientific name Crocodylus palustris, is a medium-sized reptile that can reach about 4 to 5 meters in length. Its body is typically olive to brown, with darker patterns that allow it to effectively blend into the swamps, rivers, and lakes of its habitat. This crocodile is primarily carnivorous and feeds on fish, birds, and small mammals, but it can also hunt larger animals when they venture too close to the water. The Marsh Crocodile is known for its patience and discretion when hunting, often remaining still for hours before seizing its prey. In terms of distribution, it is found in the Indian subcontinent, particularly in India, Pakistan, Bangladesh, and Sri Lanka. Although primarily sedentary, it can move short distances in search of new habitats. This species is listed as vulnerable due to habitat loss and hunting for its skin. Major threats include the draining of swamps, water pollution, and conflicts with human communities.

The Marine Iguana is a unique species found exclusively on the Galápagos Islands. This iguana is the only reptile to have adapted to aquatic life, feeding on marine algae that it collects underwater while diving. It has a distinct morphology with a robust body and a long tail, allowing it to swim efficiently. Marine iguanas are often seen basking on rocks in the sun to regulate their body temperature after their dives into cold water. This thermal hibernation behavior is essential for their survival in the Galápagos environment.