Banks 1959 Zonotrichia leucophrys 4, 18 Apr 1 mi E Pelilla Beach, Pies Ranch, 250 ft, San Mateo Co, Calif. Bird 14 (PCB 381) had brown crown, slight single layer in dull fan toward front. Wt, 31.5 gm, fat, esp. concentrated in neck region, tes, 9 x 5 mm. 19 Apr Bird 19 (PCB 382) ♀ with largest ova (2) 2 mm diam. No brood patch; ov duct only slightly enlarged. Fat on neck + back regions. Pelilla Beach, sea level, San Mateo Co, Calif. - Bird 16 PCB 383 ♀ of two shot together, ♂ slight cloacal protuberance, tes, 11 x 4 mm, Wt, 29.4 gm. Bird 17, mate of 16 (PCB 384), ♀ with well developed brood patch, very fat, wt. 32.8 gm, but largest ova only 2 mm diam. No sign of recent [Perhaps leaked ruptured follicle acc. to Bird Male] or near-future laying. Couldn't find ov duct. Fat concentrated on back, neck, and axillary regions. Apr. 18 Bird #1 (PCB 385) is ♀ with no brood patch, ova all tiny (under 1 mm). Extremely fat, weighed 26.0 gm; fat heavy on back and ventral surface, as well as neck. A couple sheathed feathers (body) came out as I was skinning. Another Bird of same white - probably gambelii. Bird #2 - brood patch ♀, ova small + ov duct small, no recently ruptured follicle. Only slightly fat, in neck area. Bird #3 (PCB 387) ♀ with brood patch, ova small, no recently ruptured follicle, small ov duct, this bird was carrying insects in bill when shot, + was parent of a 7+ day old young insect. Bird #4 (PCB 386) was collecting insects on ground. It is ♂, tes, 10 x 6. Cloacal protuberance well developed. Bird #5 (PCB 389) was a ♂ with testis 9 x 6 mm. It was