in this pattern. Each feeding period lasted approximately 2–3 hours, and traveling usually consumed approximately 20% of their day. Masked titis do have territorial displays throughout the day. The defend their territories by loud intergroup vocalizations to other groups of monkeys and to other animals in the general area. Additionally, all titi monkeys have "Dawn Calls" in the mornings in which the male and female usually duet the same song. References External links Atlantic titi Mammals of Brazil Endemic fauna of Brazil Fauna of the Atlantic Forest Vulnerable animals Vulnerable biota of South America Atlantic titi Taxa named by Étienne Geoffroy Saint-Hilaire