[drzaiusx11]

Fun fact: Chickens actually need to swallow gravel in order to digest any food since they don't have teeth. They store gravel in their gizzard and when the gizzard moves, the food is ground with any grit material inside. Once ground to a paste it can _then_ pass through the digestive tract. So definitely a component of food for chickens, unlike grass for tigers.

[thaumasiotes]

That's like saying that chewing is a component of food for humans (and everything else).

Chewing is an important way to increase the amount of nutrition you get from a fixed amount of food. It isn't itself food.