raining acorns

Here in Pasadena, California, it's the time of the year when acorns, from
the Oak trees which line our streets, are falling like rain, from some
trees.  There is a species of bird, which looks like a dove or pigeon, that
works the trees, causing the prodigious downfall. 
Has anyone seen this phenomenon?  Do you know the species of bird and what
they are after in the trees?  The activity of the birds seems directed at
making the acorns fall, but they never seem to retrieve them.

Regards,
Doug

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