I don't see any prey. Since I'm a carnivore, I will go find others
Hmm, I see a chipmunk and a hedgehog. They are my prey. I also see a wolf, which is my predator.
The wolf is gone! I am going to go get the chipmunk to eat. I am also going to eat a fruit.
Awesome! I got him. I used my poisonous tail feathers to kill him, then I could eat him.
The pattern above went on for many years. Then, one year, there were terrible forest fires that killed many of the Cateleon's prey. Luckly, the species of the Cateleon survived; but life looks very different.
The wolf was coming after me! Luckily I can fly. Since all the trees are gone, I am a carnivore. I see a rat on the ground. That will be my dinner!
After 25 generations, a changing environment, and terrible forest fires, the Cateleon species has survive, even if it lives in a very different environment. With no fruit available, they have become carnivores. They have become desert animals, and much more.