Ducklings or goslings hatch with downy feathers and the ability to walk and feed themselves, but need their parents for warmth and protection.  Ducklings or goslings wandering around without a parent in sight are likely orphaned and should be taken to a wildlife rehabilitator.  Do not place a duckling or gosling in water, as their feathers may not yet be waterproofed and they could become hypothermic or drown.