3: Food chains

I took time off coding and thought about food chains. I want my game to be simple, that's why the total number of different species should be around 5-7. After some thinking, I drew this chain in the picture below. Arrow from one specimen to another represents the possible food source. If specimens aren’t connected, they will not affect each other directly.

The main question is how the predators can disappear as no one eats them. I did research and found out that hyenas and lions could kill each other in a fight. So, my solution is that predators affect each other. Also, this decision specialized my animal setting to savannah animals.