decided upon the former and came over, lightly touching the top with his feet as passed, instead of sitting there for a while as usual, floated down gracefully to land in front of me. He lost no time in taking the mouse--probably his first meal of the day. The mouse finished, he defecated forcefully and turned his head to observe results, first from one side and then from the other. His diagnosis being favorable, his post outside now called to him. A short, quick run parallel to the fence, a quick turn to the left, a nearly vertical rise, a pat of the feet on the top wire, another float downward, the perfection of ease and grace. December 20th. R5's morning's droppings con- tain mouse fur. He has passed critical point At 8 A.M. R5's mouse was no longer in the can and a new one was put in. 9 A.M. This mouse has also disappeared and fresh droppings on the ground contain mouse fur, so we know now that R5 has been eating mice since his arrival here. (His first droppings after he was put in the cage contained no fur). It is a great relief to know that the bird is "breaking in" well. A freshly killed house mouse had been put in with the live mouse shortly before 9, but it was not taken, the live one being given preference. At 1:45 Rhody, who had been neglected all the morning, was not at his post; but he must have spotted me in the Clearing, for he suddenly appeared at the fence and flew over to get his mouse. As a test, more to determine whether a mouse could possibly got out of R5's can, than to see whether he would eat another one, another one was put in and all the ground about the can was covered with a coating of fine sand, upon which the tracks of a mouse would show plainly and incidentally also, the track of the road-runner if he went to the can. Meal worms were put also on the sand. Presence of visitors prevented my observing results until: 7:30 P.M. The mouse was still in the can. The road-runner had walked through the sand to get the worms, but had not visited the can. He was stowed away under the ceiling of the upper annex, tail against the wall in true RR fashion. Judging from the droppings that have accumulated, he is having a great feast. Except the one instance reported on the 17th., he has shown no sign of panic, merely retreating promptly to his refuge whenever he sees anybody approaching. There he stays as long as anyone is in sight, frozen. Going in and standing below him does not cause him to move at all. December 21st. (Sunrise 7:21, sunset 4:54. The shortest day in the year). Sometime between 8 and 8:30 A.M. R5 came down and gobbled the white mouse in the can. The sand coating was covered with his lop- sided k-tracks, but there were no mouse tracks! R5 had also depos- ited his morning's droppings, now liberally charged with mouse fur. Apparently, unlike Rhody at this time of year, he has no in- hibitions that constrain him to remain in his roost until late. So far he has consistently refused to eat butcher's meat and death mice. Rhody, even before he became tame, took meat that I put out in the garden for him.