March 30 12 Red-tail must could be seen on the cliff 100 ft. Above us. One Blue Heron was observed fishing in the stream standing mostly the whole length of its legs in the water. At the sight of us it took off with a low squawk & flew down the canyon. One note of a Ruby-crowned Kinglet was heard. There are a good many Red- shafted Flickers about and no trils to nest in (except an occasional Juniperus utahensis). They prefer to nest in holes in the cliffs. One was seen entering a small hole & I presume that many of the smaller holes have been "white-washed" in this manner. Some of the holes seem to be very sound; perhaps some of the digging was done by the birds themselves. Other birds are also forced to nest in the cliffs due to the other types of nesting sites being at a premium. Such birds are the Sparrow Hawks, Thrush, Mourning Dove & Black-b. Magpie. We climbed out of the canyon by a ladder farther downstream and crossed down again & photod a Marmot habitat. We picked up and left by 1:00. At the house of the custaber