Blue Jay Cyanocitta cristata 12 inches
aka the FOREST ALARM--this raucous bird will scream at any intruder in his territory.
SNOW BIRDS: an explanation for my previous image---quoting some web sources (advertisements)
SNOW GUARD--designed to prevent dangerous movement of snow on metal roofs
ICE BREAKS--used to prevent dangerous and destructive snow and ice avalanches from metal roofs
Sorry for the confusion---