1374. although he had no direct knowledge of what it contained. He watched attentively while I took off the cover and advanced with- out delay to take the mouse as soon as he saw it. (As far as I know he had had no food as yet, and was presumably hungry). However, he began his ritual immediately, made for the fence, gone over, showed the mouse at the mirror with full display, then offered it to R5, who was now down on the ground at the wire. Rhody was more persistent in his endeavor to interest R5 than I had ever seen him before, but R5 was coy. Finally Rhody gave up and looked for other candidates. During the course of his wander- ings I invited him into the cage, but he would not come. There was one period of about 10 minutes when he remained perfectly still but holding the mouse. He now went out into the street, over to the Scammell house, climbed to the roof and sat there until after 3 P.M. Not a sound from him (nor was he heard to coo all day). Finally he ate the mouse himself, sailed down to the street near me, then wandered off to his post on the west lot, probably finished for the day. Later, still an hour to sunset, he was seen in his roost. Thus far, it will be seen, that there is no conclusive evi- dence as to the sex of R5, nor, for that matter, does it appear that Rhody knows, himself. R5 has never been heard to "sing" or to use the koke, koke call made by Circe. At the same time it is very clear that Rhody, as determined by his attitude towards them, regards R5 in an entirely different light--in the cage--than he did either Archie or Terry--in the cage. These birds, while in the cage, were never courted by R, though he addressed to them a peculiar call (described at the time) which he has not used with R5. Terry when released in the presence of Rhody with a mouse in his bill, was courted (or so I interpret- ed the action) once, and then no more (as far as I know). Archie was chased away. Therefore it appears that there is a distinction which R makes between the two "sets" of birds. Of course we know that A and T were immature and were R's offspring. (Did Rhody?). I still think T was female and A male. R5 may be "anything". If a guessing contest were held as to whether R5 is an adult or a bird born last year, my guess would be the latter. If the contest were based on sex, I would base my guess on the toss of a coin. February 10th. A cloudy and chilly day. Rhody spent much of the forenoon in the brush of the west lot, in tree 9, which he has not used much the last week. 12:25 P.M. I just found Rhody sitting in nest 2-36. When I left him and climbed back over the fence, he did not hesitate to follow by way of the roof of the bird cage. I continued toward the tool house. Rhody could not get there soon enough, rattle-boooing en route (Now I wonder why). The big mouse offered him was gobbled without benefit of ritual of any kind --he had no time for love affairs--what he wanted was grub, and that without any monkey-bus- iness; let R5 look out for himself. At 1:20 he was continuing his repose in a ceanothus by the fig tree, whence he had retired soon after eating. A little earlier, Brownie was heard calling a couple of hun- dred yards off to the east at Robinson's and soon seen in the top of a pine tree. My Whistling his "purple, 1,2,3" call started Nova