Polypterus Senegalus is a fish from Africa that is able to breathe air, move in land (with their fins) and resembles prehistoric fishes that managed to evolve into tetrapods - amphibians, reptiles, birds, and mammals. The scientists studied the fish to learn how these fish move to learn the evolutionary processes that occurred 400 million years ago.
By raising the fish on land for nearly a year, they noted significant anatomical and behavioural changes. The fish walked more effectively and its biological behavior adapted to the process. The researchers hypothesized that the behavioural changes also reflect what may have occurred when fossil fish first walked with their fins on land.