Sialia currucoides June 7 Dead Meadow, 6400 ft., Lassen Co., Calif. My attention was attracted by some "churr'ing" sounds to a dead fire-scorched pine on a bare slope. A bluebird was attacking a chickaree trying to drive it out of the tree. The bluebird repeatedly dove at the rear end of the squirrel coming very close with its bill. I could not see if it actually made contact for the squirrel moved very rapidly a few feet each time. Several propers of the squirrel was down, but occasionally went back up a few feet. Finally squirrel went down to ground, bluebird flew away. All the time a Mt. Chickadee was sitting in the tree quietly at the tip of a branch, occasionally fluttering its wings watching very closely.