swans

Romeo and Juliet? This year's swans are more like dual Lady Macbeths. Mike the Mad Biologist chronicles the avian war on the lagoon:

... One day I saw one swan prevent the flock of ducklings from entering the pond: wherever the ducks went to try to jump in, the swan was right there hissing at them. That day, the swan even jumped out of the water and pursued them on land.

It gets even more vicious. The swan (again, no idea which one) will try to isolate a couple ducklings and then pursue those ducklings. The duck's mother then tries the 'broken wing' gambit (squawking loudly and then veering off, in an attempt to draw the swan away). It never works. These swans are on a mission.