PNG animation?

PNG animation?

Hello everyone :) I am very new to game making world and currently I am making an android game with an engine.

I have found a really cool dragon on this wbesite and I would like to know how can I make it to my game. When I download it there is dragon in every position in 1 image. The engine I work with requires each image for animation seperatly. How can I do that?

 

The dragon I downloaded: https://opengameart.org/content/wyvern-1