I'm not sure what yetis have against penguins, but I guess if you want to play baseball in a wintery location you do what you have to. I don't think there are enough Yeti in the world to form a team of their own - let alone have their own professional baseball league. And you have to know that if they were allowed to play with humans, their size would always make them vulnerable to accusations of steroid abuse.
Actually, the penguins don't seem to mind too much. Maybe they put up with the abuse because that's the price it takes for a flightless bird to enjoy the freedom of flight. The Wright brothers certainly had a more technical approach to mankind flying, but they certainly did not dress so formally for their air travel.
So, help the yeti and the penguin out. One mouse click makes the penguin jump and a second click makes the yeti swing.