A family member lives on a pond and has just recently acquired a new flock of wild ducks. They feed the ducks everyday. She wants to add two white ducks to her pond. Is this an okay thing to do? Will the ducks have to be cared for, or will they find everything they need on their own? How about in the winter? I'm not much of a duck person, so I figured you guys could help answer these questions. Thanks in advance.