Diurnal and arboreal, titis predominantly prefer dense forests near water. The family includes the titis, saki monkeys and uakaris. Callicebus is a genus of monkeys known as titis. Plecturocebus is a genus of monkeys known as titis. Cheracebus is a genus of monkeys known as titis. The predominant and most important predators of all titis are raptors. Like other titis, it is monogamous, mating for life. Two major types of activity have been observed in masked titis. Masked titis do have territorial displays throughout the day. Titis are monogamous, mating for life. Atlantic titis are usually monogamous (they stay with one mate throughout their entire lifespan). White-eared titis can live for more than 25 years in captivity. Titis frequently hides and shows much caution towards raptors. Historically, titis were monogeneric, comprising only the genus "Callicebus" . Historically, titis were monogeneric and formed the genus "Callicebus" Thomas, 1903.