1981 R.C. Mumme 13 Melanerpes formicivorus Low Hay (30April) 0850, ♀424 looks into Blue Oak hole briefly as I'm about to leave. 1 May 0600, a ♀ in the hole (1980) as I arrive! Uh-Oh. Believe it was ♀523, as I think I saw ♀524 in the broken tree with the other group members. At any rate, the bird looking out had 2 small (double) mustaches, and a small white flag at the right corner of her forehead. I doubt eggs were laid, but you never know. 0615, a bird here Karritting + garricking from the watch tree must be ♀604 again 0830 Checked the '80 hole, nothing. ♀423 + ♀424 both looked into it while I was watching, but nobody entered. 0307 looked at the '79 nest, but did not enter. No action at all in the Blue Oak hole. However, I saw lots of flights over toward the roost hole, so I think I ought to check that out. Couple of points ① Birds seem to be pairing up. ♂461 is definitely following ♀524, and I think ♂307 is keeping tabs on ♀523. Will have to check that out later. ② Still some aggressiveness displayed toward ♀523 by ♂461. Saw 2 instances, once over acorns. The Second instance was at 0830, ♀524 looking into the '80 nest, ♀523 flies over, opening wakas, ♂461 then comes over + pecks hard at ♀523 ~5 times, driving her away from the hole. ♂307 also came over, but I'm not sure what happened after that. ③ ♀604 (presumed) is still around the periphery, garricking etc,