I used to hand feed a swan at a park my hubby and I would go to every day after work. They can hurt! After awhile the swan (and geese) got to know me and my voice and I could call them and they would come! Sadly some people of a different ethnicity cut the swan's head off and took the body home for a meal.
On a happier note, the swans and geese that habitate on the river in back of the house are now my "buddies" and I can hand feed them too.
LOL The geese walk right up to the door and honk to let me know they are there!