Name that insulation

This is a new form of insulation I've not seen before, clinging under the attic rafters of a 1902 home in Berkeley, Calif. Can you name the bird or other critter that's developed this unique form of insulation? The white lines are plaster "keys" poking through the lathe between the ceiling joists.

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Comment by Chris Heenan on December 1, 2011 at 7:26pm

this one is creating a buzz

Comment by Guy DuBois on August 20, 2011 at 11:07am
I dare you to poke it with a stick!
Comment by hollis micklon on July 6, 2011 at 9:58am
I recently removed honeycomb with honey in it-20 lbs-have pictures too!
Comment by Bruce A. Bailey on June 30, 2011 at 11:17am
I agree with Ed. Looks like an old Hornets nest.
Comment by Barry Zeeuw on June 27, 2011 at 2:41pm
Is Berkeley anywhere near the Mission of San Juan Capistrano?
Comment by George Kopf on June 20, 2011 at 1:28pm
What are the dimensions (roughly)?
Comment by Ed Ballard on June 9, 2011 at 8:28pm
Looks like a hornet's nest to me.

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