The word "foot" typically refers to the structure at the end of a limb that allows for walking, running, or other forms of locomotion. Most animals that walk or run have more than one foot, often in pairs.
Some animals, like insects, have multiple legs, but these are not considered "feet" in the traditional sense.
It's possible you're thinking of a specific type of animal or creature that has a unique characteristic. Could you provide more details or context?