The mallard is my favorite duck. I know that I can find a mallard almost anywhere I go where there is a bit of water. In fact, that very homeliness makes them appealing. Mallards are always there - like good friends. You can't be at all homesick when you've spied a mallard in your travels.
Mallards will stand still and let you take their photo no matter what they are doing. They are patient and wait for a treat...quack a soft 'thank you' and tuck in. Of course, that makes them even more willing to stand still for a shot.