Flounders have a very flat body and their eyes are all on the same side, and among vertebrates, flounders are the only ones whose bodies are completely unbalanced from side to side.

When swimming, the body swings from side to side, but it looks like the tail is waving up and down as it swims forward. Flounders are usually called flounders if their eyes are tilted to the right and turbot if they are tilted to the left, but there are many exceptions to this rule.

Flounders usually hide in the sand, leaving only their eyes visible, and their body color changes according to their surroundings, making them extremely hard to spot