Dipnoi, commonly known as lungfish, are unique for their ability to breathe air through lungs as well as gills. Found in Africa, South America, and Australia, they inhabit freshwater environments. Lungfish have elongated bodies and can survive in oxygen-poor waters by estivating in mud during dry seasons.

Dipnoi, commonly referred to as lungfishes, are native to specific regions in Africa, South America, and Australia. The African lungfishes are primarily found in the freshwater systems of Sub-Saharan Africa, including rivers, swamps, and lakes in countries such as Nigeria, Congo, and Mozambique. The South American lungfish, also known as the 'lepidosiren', is found in the river systems of the Amazon Basin. The Australian lungfish, known as the 'Neoceratodus forsteri', is native to the Mary and Burnett river systems in Queensland, Australia.

Lungfishes inhabit freshwater environments that are often subject to seasonal changes. These habitats typically have warm climates with water temperatures ranging from 22°C to 30°C (72°F to 86°F). African and South American lungfishes are adapted to living in oxygen-poor waters and can survive dry seasons by aestivating in mud. The Australian lungfish prefers deeper, slow-moving, or still waters with abundant vegetation.

Lungfishes are unique in their ability to breathe air using lungs, allowing them to survive in environments with low oxygen levels. This adaptation is crucial for their survival during dry seasons when water levels in their habitats decrease significantly. They play a critical role in their ecosystems as both predators and prey, feeding on a variety of invertebrates and small fish while providing a food source for larger predators.