Humilis - chiapanus 64 Rio Tliltzac April 9 guanacaste tree . they find areas where bark is decayed or infected & hang to the trees in all manner of positions - as frequently as not upside down as they probe the bark fragments. We watched two birds doin this on the trunk of the tall guanacaste + veins and for 10 minutes 2 birds worked up a vertical trunk of another guanacaste . The tail is not intent- ionally used as a prop but sometimes it serves the purpose. After they seem to loose balance and start to fall downward but their feet are securely hooked into the bark so they swing upside down and continue probing. This feeding behavior is very similar to that of a nutcracker. - Very rarely they go to the ground although not too infrequently they may forage over small trunks of bushes 1/2 - 1 foot above the ground. However, 90% of their feeding is done in the middle or higher portions of the vegetation and all places are fragmented from vertical tree trunks to the ante, most leaves in the tallest of the guanacastes or anates. The same found of medium sized or small trees with veins or many small branches. Thryothorus was common in the area and restricted to the ground or 1/2 - 1 1/2 feet above in denser parts of vegetation. In area g humilis pair # 1 I watched 2 humilisi foraging in a small tree about 2 feet above a pair of pleroskterus which was working on the ground . They are absolutely sympatric with humilisi