Duck droppings are harmful if allowed to dry and harbor a mould that when ingested will cause long term illness. Mainly small children are at risk. The droppings in the pool will be sanitised by the pool chlorine however I would like to see the level of chlorine sanitiser at around 5ppm to be sure.
Also make sure to clean the filter often.
Yes, they do. Otherwise there would be no Mallard Ducks.
Yes there are mallard ducks
I think that they can since my mallard and my cayuga duck did mate and have ducklings.
no not all ducks sorry
If the result you want is a mallard, yes. If mallards can just breed with other ducks, yes, a mallard duck can breed other breed ducks.
Yes they do get along well my mallard and my pekin duck mated and had ducklings.
Mallard ducks were never introduced. Mallards were the first duck ever on planet Earth.
Mallard ducks are not capable of changing gender. There is no known species of duck that is capable of that.
Mallard ducks are common in the United Kingdom. Often, they reside in parks and get their food from humans who will feed them.