This mural demonstrates the process of evolution with real examples of different animals that have evolved into other animals or different forms. It is funny because all the examples of evolution are "disappointing" and went from cool animals to ones that weren't as cool. The first example is a dinosaur evolving into a chicken. The second is a wolf evolving into a chihuahua. The third example, which is the real joke, is the platypus and is followed by a barely different platypus because the platypus never evolved.