"Crows ... among the world's most intelligent animals"- (Wikipedia) Watch ... LISTEN and learn

I have been feeding this murder (flock) ... for years - never a dull moment ...This particular Murder of Crows maintain the block I live on - it is their "territory" it would seem. They have become familiar with me over a very long period of time. Unlike the studies in Seattle whereas they proved the crows ability for facial recognition in humans this is a somewhat the same however rather attack the subjects wearing masks these have become familiar with me over time and rather than flee or attack me - they follow me and seek me out for food in their own territory and do not seem to want to "cross" over invisible (territory) borders? ..... for they do not become a nuisance I refuse to respond if the caw ... they get my attention by swooping my windows and will however respond to me if I whistle or stand on my balcony - they watch my balcony from different vantage points and if I stand on my balcony and one sees me within moments there is a flock - or a murder whichever you would prefer