Arowanas are a freshwater fish native to Africa, India, and Australia with a fondness for fatherhood. Besides being expert underwater nest builders, they are also “mouthbrooders.” What are mouthbrooders, you ask? Well, imagine that the only way to keep your infant safe was to keep it in your mouth until it was old enough to fend for itself. Now multiply that by nearly a hundred infants for the arowana. And while it does let its fishlings out of its mouth occasionally to explore the lake floor, the father arowana has a remarkable ability to keep track of how many of its fry it still has left to “bring home.” Just don’t swallow!