Reisen, J.V. 1975 Downy Woodpecker Dendrocopus pubescens Feb. 28 Tilden Reg. Park, Contra Costa Co., Calif: 1 ♂ located drumming on a dead limb of a Monterey Pine near Playas Field parking lot. As we were watching it drum, a Nuttall's Woodpecker flew into the grove and directly at the Downy, displacing it. The Downy flew out of the grove and the Nuttall's immediately began to drum. This bird appeared to be a ♀ (!), but I couldn't bee 100% certain. The Nuttall's drum was faster and more prolonged (slightly) than the Downy's. Perhaps these species are interspecifically territorial in areas of coexistence - certainly body sizes are almost identical and one might predict substantial competition between the two, although I would say that the Downy is found more often on very small branches and twigs whereas Nuttall's is more of a main-trunk forager. Oct. 4 Rodeo Lagoon, Marin Co., Calif: 1 ♂ watched apparently enlarging nesting/roosting cavity on underside of horizontal Monterey Cypress limb - all that we could see of the bird was the tail. Seems a strange time of the year to be excavating.