Why do goldfish move their mouth?

- Breating: Goldfish breathe by taking in water through their mouths and expelling it through their gills. They move their mouths to create suction that helps draw in water.

- Eating: Goldfish are omnivores and will eat a variety of things, including plants, insects, and other small animals. They move their mouths to chew on food and grind it up into smaller pieces.

- Cleaning: Goldfish use their mouths to clean themselves and their surroundings. They will often rub their mouths against plants and rocks to remove algae and other debris.

- Communicating: Goldfish move their mouths to communicate with each other. For example, they may move their mouths to display aggression or to attract a mate.

- Exploring: Goldfish are curious creatures and will often move their mouths to explore their surroundings. They may put objects in their mouths to see what they are made of or to taste them.