What is your favorite tree? It can be in your yard or not. I love the Japanese Fire Trees. I have in my yard, though

[RockRaven]

230. California black oak -- Quercus kelloggii

So many to choose from, of course. Tomorrow my answer might be different.

https://en.m.wikipedia.org/wiki/Quercus_kelloggii
An excerpt from the "Ecology" section:

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,[7] 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.

Older trees affected by heart rot have cavities which provide den or nest sites[2] for owls, various woodpeckers, tree squirrels, and American black bears. Trees provide valuable shade for livestock and wildlife during the hot summer. California black oak forest types are heavily used for spring, summer, and fall cover by black bears.

It is browsed by deer and livestock.[8] Acorns are heavily used by livestock, mule deer, feral pigs, rodents, mountain quail, Steller's jays, and woodpeckers. Acorns constitute an average of 50% of the fall and winter diets of western gray squirrels 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 preferences for California black oak. The parasitic plant Pacific mistletoe (Phoradendron villosum), which commonly grows on this oak, produces berries that attract birds, as well.[3]