Lungfish have hard bones, and, for most species, their bodies are covered with scales. Their gills are hidden under a movable gill cover, and they also have a swim bladder inside their body to provide them with buoyancy. The lobofin and its relatives share characteristics similar to those of sharks. Although Osteoglossus still has some primitive characteristics, lungfish and Osteoglossus are representatives of typical bony fish with lobe fins, living in freshwater or oceans. The lobe fish lives in large rivers in Africa. It has a long body, short and thick fins, and a row of small fins on its back, which can be raised and lowered like a sail. They breathe by swallowing air, and they can also crawl along riverbeds, using their front flippers to drag their bodies forward.

African Lungfish

African Lungfish is a type of lungfish. They mainly live in the freshwater areas of inland Africa. The adult African Lungfish is 50 to 100 centimeters in length. In the early stages of drought from August to December, African lungfish will drill a hole in the soil, curl up in a cocoon-like body, and breathe with their lungs. This way they can survive for several months. This is the so-called "estivation."

South American Lungfish

South American Lungfish lives in places with long dry seasons. When the sea water dries up on land, each lungfish will dig a hole in the mud and breathe air until the rainy season arrives. Then, it will crawl out of the hole and return to its normal lifestyle.