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The leaves start out red, change to green, then yellow and brown, which is, of course, why it's called a Black Oak.
The California Black Oak "is a critical species for wildlife. Oaks (Quercus spp.) may be the single most important genus used by wildlife for food and cover in California forests and rangelands, and California Black Oak occupies more total area in California than any other hardwood species. Livestock also make heavy use of this species for food and cover.
Cavities in the trees provide den or nest sites for owls, various woodpeckers, tree squirrels, and American Black Bears. Trees provide valuable shade for livestock and wildlife during the hot summer months. California Black Oak forest types are heavily used for spring, summer, and fall cover by Black Bear.
It is browsed by Mule Deer and livestock. Acorns are heavily utilized by livestock, Mule Deer, feral pigs, rodents, Mountain Quail, Steller's Jay, and woodpeckers. Acorns constitute an average of 50% of the fall and winter diets of Western Gray Squirrel and Black-tailed Deer during good mast years. Fawn survival rates increase or decrease with the size of the acorn crop.
It is a preferred foraging substrate for many birds. All of 68 bird species observed in oak woodlands of the Tehachapi Mountains of California used California black oak for part of their foraging activities. Acorn Woodpecker, Bullock's Oriole, and Nashville Warbler show strong preference for California Black Oak." Wikipedia
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