I think it is no coincidence that a group of crows is known both as a 'murder' and a 'congress'.
The crows are roosting. Fall brings the end of mating and rearing season and their normally small, tight-knit family groups coalesce into huge groups. The strategy isn't particularly socially motivated, but towards the end of the day when the roost moves to its sleeping spots, a lot of gregarious social interaction can be seen.
The main objective of the roost is believed to be that being able to hold down large and favorable feeding areas that would not be possible to do with smaller groups of birds.
There's aslo a safety-in-numbers theory, as the crows gain protection from their number one predator: the owl.
Finally, it is thought the crows gathering in "urban roosts" are using their smarts to take advantage of the slightly warmer urban temperatures, bigger trees for roosting, and the general prohibition of firearms being fired (at them) in urban areas.
The crows in town have always congregated near the arboretum. Montlake is their turf.
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