The Oak Titmouse (Baeolophus inornatus) is a small songbird found in oak woodland habitats in western North America. It measures around 4.5-5 inches in length and has a wingspan of 7.5-8 inches. It weighs approximately 0.4-0.5 ounces. This bird has a grayish-brown plumage with a prominent tuft on its head, which is a distinguishing field mark. Its underparts are paler in color, and its bill is short and dark.

The Oak Titmouse is a non-migratory bird and can be found year-round in its preferred oak woodland habitats. It is a social species and often forms flocks with other small birds during the non-breeding season. During the breeding season, they form monogamous pairs and defend their territory from other birds.

The Oak Titmouse feeds on a variety of insects, seeds, and fruits. It forages in the branches and leaves of oak trees, often hanging upside down to find food. It will also store food in crevices and under loose bark for later consumption.

The Oak Titmouse is a cavity-nesting species and often uses old woodpecker holes or natural tree cavities to build its nest. It will also use nest boxes if provided. The female lays 4-7 eggs, which are incubated by both parents for around 14 days. The young fledge after 18-20 days.

Although the Oak Titmouse is not considered a threatened species, its populations have declined in some areas due to habitat loss and fragmentation. Conservation efforts have been put in place to protect its oak woodland habitat and to provide nest boxes in areas where natural nesting sites are scarce.