When most ducks and other waterfowl hatch the chicks are precocial. Precocial birds are birds that are born with their eyes open, covered in down feathers and able to leave the nest soon after they hatch. Some precocial birds, such as ducks, follow their parents for protection after leaving the nest but are able to find their own food. Other precocial birds, like grebes, need to rely on their parents for food and protection. Birds that are born blind and with out feathers, such as song birds, raptors and many others, are classified as altricial.