During an early evening visit tonight, observed the female peregrine perched up high, near the corner, to the east of the nest ledge.  It had just landed and immediately attracted the attention of a nearby Northern Mockingbird.  The Mockingbird incessantly and relentlessly bothered the female peregrine.  According to Mass Audubon, nearly all birds will display aggressive behavior when they perceive a threat to their nest or young.  The mockingbird is without a doubt the most zealous—harassing, people, domestic animals, and other birds!