Fact 1: Webbed feet are used for moving faster through water by aquatic animals.

Fact 2: All ducks have webbed feet.

Given the two facts above, answer the question "ducks can move fast through the water due to their specialized what" with the following options: 
- feet
 - speed
 - size
 - bills
 - Limbs
 - beaks
 - wings
 - Tail


 

 feet        