Questionnaires had color photographs and descriptions of the eastern fox squirrel and western gray squirrel.
Articles included photographs, information on introduction of the eastern fox squirrel into southern California, and a request to assist by reporting locations of both species on the website.
To determine if people submitting data to the website were able to accurately distinguish among the eastern fox squirrel, western gray squirrel, and California ground squirrel (Spermophilus beecheyi), 50 addresses were selected randomly from the 473 addresses submitted to the website.
Distribution of the eastern fox squirrel in Los Angeles County as of June 2004 (Fig.
Distribution of the eastern fox squirrel along the border of Los Angeles and Ventura counties, as of June 2004, included the cities of Northridge, Chatsworth, West Hills, Agoura Hills, Calabasas, and West Lake Village.
Unlike what is seen in Los Angeles and Ventura counties, the eastern fox squirrel occurs in several isolated pockets of Orange County.
Distribution of the eastern fox squirrel within Los Angeles, Orange, and Ventura counties overlaps that of the western gray squirrel in less-developed foothills supporting substantial populations of mature, coast live oaks (Quercus agrifolia).
During this time, about 1980, the eastern fox squirrel expanded its range into new areas by intentional introductions into Long Beach (R.
However, due to the multitude of introductions and transfers of squirrels, details of the introduction and spread of the eastern fox squirrel in southern California are difficult to reconstruct.
Input from the community via our website, as it pertained to presence or absence of the eastern fox squirrel and western gray squirrel over time, became valuable for reconstructing the historical movement of the eastern fox squirrel throughout the region in the decades following 1940.
The eastern fox squirrel (Sciurus niger) has generally remained restricted to areas of human habitation throughout southern California since its introduction into Los Angeles in 1904 (Becker and Kimball 1947; King 2004).
The eastern fox squirrel has been introduced into many western states (Flyger and Gates 1982; Jordan and Hammerson 1996).
Within the past 30 years, residents of Los Angeles County have noticed a decline in the number and range of western gray squirrels coinciding with an increase in the number of eastern fox squirrels (Byhower 2002; Byhower and Lokitz 2000).
While many eastern fox squirrels were observed during most surveys, only one western gray squirrel was ever observed during any survey.
niger in those habitats (examples, Lacy Park in San Marino, Lanterman Developmental Center in Pomona, a residential area in Altadena adjacent to Eaton Canyon) we report here a documented case, with a timeline, where western gray squirrels have been replaced by eastern fox squirrels at a specific location.