We all know that fishes live under water. The capability that has been attained by Mudskipper (a fish) to "walk" on land for some time is the result of :
The presence of specific features or certain habits, which enable a plant or an animal to live in its surroundings, is called adaptation. With time, this fish gained the capability to walk on land for some time. Who knows, fishes may adapt themselves and live on land!