9/14/16 I just posted what’s below to our FB site, but a higher resolution video can be seen HERE . (Note: Video activity starts at about the 15 sec mark.)
A few days ago the Starr Ranch Trail Cam caught an interaction btw four Acorn Woodpeckers, apparently from “rival” colonies. This behavior is well documented, but not often seen- let alone captured on video.
Sea and Sage Audubon’s Sylvia Gallagher helped explain it all by pointing me to what The Birds of North America has to say: Power struggles are “the most dramatic agonistic interactions” of Acorn Woodpeckers. They occur when either the dominant male or the dominant female of a colony dies and are more intense when it is the female. “The right to fill such vacancies may be contested by up to 20 or more nonbreeding helpers from other social groups who fight . . in contests lasting days or weeks . .”
Also, check out Sylvia’s excellent recording packages of birds sounds: http:///AudubonH…/