Property viewing or singles holiday?

We have seen few mallards in the last few months but yesterday a group of seven turned up, four drakes and three ducks. They swam round in a group checking out the moat as if they were viewing to check suitability for nesting. As the day wore on there was a distinct pairing off with one pair starting to separate themselves and the others swimming male and female together (except for the duck that had two drakes in tow).