1980 Walter D. Koenig 6 Melanerpes formicivorus San Geronimo, Marin Co., Calif. (18 March) difficult for him to close his mouth; he disappeared about a week ago after several unsuccessful attempts by Ms. Tyler to catch him. This left only 1 yellow, a ♀, who was here today along with at least 2 normal ♂♂ and several ♂♂. I brought 2 of the Chickadee traps, which we baited ♂ and set. One Acorn Woodpecker, a normal ♂, went in and got caught right away. I measured and banded him as follows: USFWS #812-35986 ♂ (tail spots); wt = 80.5 gm; WC: 132 mm; Bill L = 31.6 mm. Bands: Red / M Red / Red After this the wickers were shy and no others got themselves captured, but I left her the traps along with some bands and instructions so with luck she may be able to get everyone here eventually. I also asked her about the origin of the yellows again. Apparently they saw none, despite having fed them for some time, until 28 May 1975, when all of a sudden 2 or 3 starting coming to the feeder all at once. Then they continued to be common later on as some of the babies produced by this group were yellows as well. This doesn't really clear up the mystery of their origin, but it does sound as though the "invasion" of yellows on 28 May were probably newly-fledged young. Possibly one of their parents had the gene but it wasn't expressed: possible only if it's dominant, I guess! Jane also said something