Guidepost 2: What are the four goals of the scientific study of human development, and what do developmental scientists study? 1  The study of human development seeks to describe, explain, predict, and modify development.  Ways of studying human development are still evolving, making use of advanced technologies.
Dabbling ducks eat plants, seeds, grasses and other small insects and animals that they find on or under the water. Ducks which have broad beaks, (shovelers) sift their food for insects, snails and seeds from the mud.
Many ducks also eat gravel, small stones or sand. While these items do not provide any nutritional value for ducks, gravel, stones, and sand actually help ducks digest their food better. The rough texture helps break down the duck's food.ome of the plants that ducks eat are grass, weeds, algae, seeds, grain, berries, fruit and aquatic plants. Some of the animals that ducks eat are snails, mollusks, worms, frogs, salamanders, small fish and fish eggs. Ducks also eat insects. One species of duck called the Merganser, eats mostly fish.