The Black-crested Titmouse (Baeolophus atricristatus) is a small songbird that can be found in the southwestern United States, particularly in Texas and parts of Mexico. It measures around 4.75 to 5 inches (12 to 13 cm) in length, with a wingspan of approximately 7.5 to 8 inches (19 to 20 cm). It weighs around 0.3 to 0.4 ounces (8 to 12 grams), making it one of the smaller species of titmouse.

The Black-crested Titmouse is easily recognizable by its distinctive black crest, which extends from its forehead to the nape of its neck. Its upperparts are a pale gray, while its underparts are white. It also has a black patch above its beak and a small black eye stripe. This species is very similar to the Tufted Titmouse, but can be distinguished by its black crest and darker gray coloration.

The Black-crested Titmouse is a non-migratory species, meaning it stays in its breeding range year-round. Its habitat includes oak and juniper woodlands, as well as mesquite and brushy areas. It is a cavity nester, often using abandoned woodpecker holes or other natural cavities for its nests. It can also use nest boxes if they are available.

In terms of behavior, the Black-crested Titmouse is a very active and acrobatic bird, often hanging upside down from branches in search of insects and seeds. It is a social species and can often be found in small groups. Its diet consists of insects, seeds, and berries. During the breeding season, the male will establish and defend a territory, and both parents will work together to raise their young.

Overall, the Black-crested Titmouse is a fascinating species of bird that can be found in the southwestern United States. With its distinctive black crest and acrobatic behavior, it is a joy to watch and observe in the wild.