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.
Dabbling or Diving, It's All Fine Dining. More than 28 kinds of ducks live in North America, and each has its own characteristics. Among them is the size and shape of the beak, also known as a bill. Ducks fall into one of two categories: dabbling or diving. Dabblers mostly eat in shallow waters, dipping their heads underneath to reach prey below. Divers eat in deeper waters and like their name, dive underneath for food. The size and shape of a duck's beak determines how he finds food.