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.
Mallard ducks are omnivores, so they have a lot of plants and animals to choose from when it is time to eat. Some of the vegetarian entrees for Mallards are water elm seeds, oak seeds and hackberry seeds.Mallard ducks also eat wild rice, corn, wheat and barley. Other plants in a Mallard's diet include bulrushes, primrose and willow. Insects such as beetles, flies and dragonflies are tasty treats for Mallard ducks.Mallards also eat mollusks, small fish and fish eggs.On the water's surface, Mallard ducks also feast on frogs, tadpoles, worms and snails. These types of foods provide the protein and fat nutrients a Mallard duck needs in its diet.ther plants in a Mallard's diet include bulrushes, primrose and willow. Insects such as beetles, flies and dragonflies are tasty treats for Mallard ducks. Mallards also eat mollusks, small fish and fish eggs.