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A bunch of crows have established a roost during the last two weeks in some trees behind me (Bridgewater, nr Shipyard's Landing). This is the first time I have lived near a crow roost and they have a strange pattern of overnight calling. Silence for hours at a time after they have settled down at dusk and occasional eruptions of cawing during the night that last about an hour. When I leave (usually around 5:30am) if they are not already in a cawing session they start. Is it a predator threat (me or something else making noise) that sets them off? Or do they just engage in periodic nighttime social chattering? Maybe both. Nancy
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