Body: Several size classes, ranging from 2 1/2 to more than 15 pounds. Blackish brown back and sides. Chest and belly vary from brownish to pearl gray with larger subspecies usually lighter. Head and neck jet black with white cheek- and throat-patch. Bill and feet black. Voice: Deep-throated honk. In Flight: Black head and neck with white cheek and throat evident. Immature and adult similar.