The blue mockingbird builds a cup nest of twigs and rootlets. Measuring in length, and weighing between , the blue mockingbird is a medium-sized mimid. The blue mockingbird is uniformly blue on its back, tail, wings, head and underbelly. The blue mockingbird has historically been considered conspecific with the closely related blue-and-white mockingbird. The blue mockingbird ("Melanotis caerulescens") is a species of bird in the family Mimidae.