Home ranges vary in size from 13 to 39 acres (5 to 15 ha) (Mock and Jones 1990). The coastal California gnatcatcher is non-migratory and defends breeding territories ranging in size from 2 to 14 acres (1 to 6 hectares (ha)). California Gnatcatcher Polioptila californica Patrick J. Mock Within the United States, the California Gnatcatcher lives only in coastal southern California’s sage scrub, a habitat threatened by the continuing spread of agriculture and suburbia. This large lizard is considered a California … The breeding season of the coastal California gnatcatcher extends from late … Both parents incubate the eggs, taking half-hour shifts, alternating … wintering and breeding loggerhead shrike on the site (at the mesa; Figure 6). They may make limited use of adjoining habitats, especially during the winter when territories are typically larger than during the breeding season (Atwood, 1990; Rotenberry and Scott, 1998). Low-lying, open-cup nests are built by both parents in areas with a less-than-40-percent slope gradient. Woody perennial plant cover in California Gnatcatcher territories typically … Even within the sage scrub the gnatcatcher is … A high rate of nest predation is compensated by up to ten re … Report of Coastal California Gnatcatcher Juvenile Dispersal across Interstate-8 at the MSCP Southern Lakeside Archipelago Lands San Diego County, California BREEDING: The breeding season for monogamous pairs of coastal California gnatcatchers lasts from late February through August. These data are intended to be used as a guide to identify the general areas where final critical habitat for the coastal California gnatcatcher (Polioptila californica californica) occur. Report of Coastal California Gnatcatcher Juvenile Dispersal across Interstate-8 at the MSCP Southern Lakeside Archipelago Lands, San Diego County, California Varanus Biological Services/Campbell BioConsulting 15 June 2003 i EXECUTIVE SUMMARY This report provides methods, results, discussion, and recommendations for a study of California One sensitive herptile was observed (and photographed), the coastal whiptail Aspidoscelis tigris stejnegeri, found 20 Sept. and incidentally earlier in the season. With a roughly 120 day breeding season, they may be able to have as many as three broods per season. The breeding season of the coastal California gnatcatcher extends from late February through July with the peak of nest initiations occurring from mid-March through mid-May. Average clutch sizes number four aquamarine-colored eggs, and incubation lasts two weeks.