Marbled African Lungfish (Protopterus aethiopicus)

African lungfish live in freshwater swamps, backwaters and small rivers in West and South Africa. These prehistoric animals have survived unchanged for nearly 400 million years and are sometimes referred to as "living fossils."African lungfish have some fascinating adaptations. They have two lungs, and can breathe air. This is a vital feature, since they live in flood plains in waterways that often dry up. To manage this life-threatening situation, the lungfish secretes a thin layer of mucus around itself that dries into a cocoon. It can live out of water in this cocoon for up to a year, breathing through its lungs until rains refill its waterway.