. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. COOPER HAWK NESTING 145 Avood rats. Other rat nests were present in the top of the tree and at its base. The nest was coarselj^ lined with a few drj^ oak leaves, pine needles, and strips of bark. There were four eggs. During the two weeks interval from the date of discovery until the eggs hatched, the incubating female was observed on the nest on several occasions. On May 28, one egg had hatched and another had pipped. On the followin
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. COOPER HAWK NESTING 145 Avood rats. Other rat nests were present in the top of the tree and at its base. The nest was coarselj^ lined with a few drj^ oak leaves, pine needles, and strips of bark. There were four eggs. During the two weeks interval from the date of discovery until the eggs hatched, the incubating female was observed on the nest on several occasions. On May 28, one egg had hatched and another had pipped. On the following morning the second egg had hatched and a third was partly broken open. Late in the afternoon of May 29, the third young had hatched and already was dry and fluffy; the fourth egg was begin- ning to hatch. On the afternoon of Maj^ 30, this last young had emerged and the four nestlings were of noticeably different sizes. On June 3, one of the larger young was removed from the nest and brought into the laboratory where it was kept alive. The other three birds remaining in the nest were observed from a blind placed in the tree about 15 feet from the nest. On June 23, two of the young were observed to leave the nest for the first time. From this date, until the latter part of July, they were observed from time to time in the nest tree and the surrounding territory. Supplementary in- formation was gained from visits to another Cooper hawk nest located about one mile north- west of the one under intensive stud3^ Behavior of Adult Birds During the period of incubation, the female usually flew off the nest and left the immediate vicinity while observers were climbing the nest tree. She would some- times move about in neighboring trees, calling occasionally was not usually in evidence during incubation. xifter hatching, the female was more reluctant to leave the nest and became increasingly aggressive on successive occasions. She no longer kept out of sight, but flew from one perch to
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