The diversity of mammals in San Diego County is greater than any other county in the United States, yet there has been no synthesis of their identification, distribution, natural history, or the conservation challenges they face—until now.

https://timesofsandiego.com/life/2017/12/04/get-know-san-diegos-fauna-new-mammal-atlas/

On an unseasonably warm December afternoon in the mountains of eastern San Diego County, Boulder Creek’s name feels half-right—hundreds of stony
gray outcrops line a dry indentation in the land. In a couple of months, rain will fill the creek up to six feet deep, forming the largest tributary of the Upper San Diego River and eventually emptying into the El Capitan Reservoir.

http://newscenter.sdsu.edu/sdsu_newscenter/news_story.aspx?sid=77039