Comparative Periods of Nestling Life 97 



Bds. Va., 120); probably at least 90 days (Oberholser, U. S. Dept. 

 Agri. Biol. Survey, bul. 27, 9.) 



Black Gyrfalcon, approx. over 60 days (Bendire quoting Tur- 

 ner, Life Hist, I, 187.) 



Duck Hawk, 40-44 days (Allen and Knight, Bd.-Lore, xv, 6; 

 Dixon, Condor, x, 198; 41 days (Richards, Auk, xxxvi, 350.) 



American Sparrovir Hawk, 27-29 days (Sherman, Auk, xxx, 417.) 



PANDIONID^: 



American Osprey, about 28 days (Chapman, Bd.-Lore, x. 155; 

 Wheelock, Bds. Calif., 165); 35-45 days (Howe, Auk, xii, 389; 

 Skinner, Condor, xix, 120); about 42 days (Chapman. Camps and 

 Cruises of an Ornithologist, 52.) 



STRIGID^: 



American Bam Owl, 56 days (Finley, Am. Bds., 81.) 



BUBONID^: 



American Long-eared Owl, about 28 days (Burns Ms.); about 

 35 days (Wheelock, Bds. Calif., 169.) 



Short-eared Owl, 14 days, though only a few feet from the nest 

 for a month longer (Saunders, Condor, xiv, 120.) 



Florida Barred Owl, about 42 days (Bendire quoting Ralph, 

 Life Hist. I, 342.) 



Screech Owl, 30-32 days (Sherman, Auk, xxviii, 166.) 

 California Screech Owl, about 35 days (Bendire quoting Em- 

 erson, I, 342.) 



Rocky Mountain Screech Owl, at least 30 days (Rockwell, Con- 

 dor, ix, 144.) 



Great Horned Owl, 44-46 days (Keys, Condor, xiii, 1.) 

 Pacific Horned Owl, 49 days (Dixon, Condor, xvi, 53.) 

 Western Horned Owl, about 56 days (Cameron, Auk, xxiv, 268.) 



PSITTACID^: 



Carolina Paroquet, more than 45 days (Nowotny, Auk, xv, 31.) 



CUCULID^: 



Road-runner, less than 7 days, and in 30 days able to care for 

 itself (Sutton, Bd.-Lore, xiii, 58, and xv, 324.) 



Yellow-billed Cuckoo, 7 days (Herrick, Jour. Exp. Zool., ix, 171; 

 Pop. Sci. Monthly, 77, 95; Burns Ms.): 9 days (Bayliss, Auk, xxxv, 

 162.) 



California Cuckoo, less than 14 days (Jay, Condor, xiii, 69.) 



Black-billed Cuckoo, 6-7 days, climbing until the 15th day 

 (Saunders, Bd.-Lore x, 205; Shuver, B.M.O.C, ii., 16; Herrick, Pop. 

 Sci. Monthly, 77, 128.) 



ALCEDINID^: 



Belted Kingfisher, 24-28 days (Baily, Bd.-Lore, ii, 77; Herrick, 



