Medium-sized woodpecker. Unique face pattern with a red crown, yellowish forehead and throat, and pale eye. Glossy black overall with a clean white rump and streaked chest. Lives in mixed oak-conifer forests, where they are found in large groups, hoarding acorns in tree trunks and telephone poles, and breeding cooperatively. Listen for their raucous, scratchy "waka-waka" calls. Nests in cavities.