It is amazing to me that these animals can do this for a number of reasons. Not the least of which is the commitment to propagating the species. Live birth has some advantages, such as not being a sitting duck for folks who might want to eat you.
Eating the duck brings up some questions on my part,
This duck has proven that ducks are smarter than rabbits, sorry Bugs. The stupid rabbit had her babies in Wiley's yard, where they were shaken to death by the dog. At least the duck was smart enough to have her babies in the front, pretty much out of our way. You really wouldn't know she was there unless you were looking for her.
Ultimately, here is the problem with our friend the duck, it is that next year she will come back. The return to their nesting places year after year, and then their off-spring will use the same location. I am not thrilled about the prospect of raising generations of ducks in my yard. Who said there isn't wild life in the city. Where is that dang coyote when you need him?