Gizzard

Real World Example

Imagine trying to crush a handful of nuts without a nutcracker, relying solely on the strength of your hands. Just like your hands would struggle to break down those hard nuts for easier consumption, birds and earthworms face the challenge of breaking down tough food without teeth. The gizzard acts like a natural nutcracker for them, using its muscular structure to grind down food into smaller, digestible pieces, much like how your hands would attempt to crack open the nuts to make them easier to eat.