The meat-based pet food industry has a lot of products that are made from animals that your pet do not naturally eat.
We have kangaroo meat for cats in Australia but cats do not hunt in a pack, therefore, it would be impossible for them to take down a kangaroo by themselves. We like to associate cats with fish but cats cannot dive into the ocean to catch fish like salmon, sardines or mackerel.
There is virtually nothing natural about commercial pet food.