A few years back I was in a park where everything was peaceful: sun shining, woman reading on a park bench, swan nibbling grass nearby and me walking. Then another woman started Tai Chi. One of the moves (snake something) made her arm look like a birds head and neck. The swan had, quite literally, a hissy fit. Up on tiptoe, wings out and flapping, feathers all fluffed out to twice his peaceful size and hissing like a cobra. We were the ones who backed down! The woman left muttering something about doing her martial arts somewhere else where the birds wouldn't object.