Behavior
Some vocalizations of black titi are listed here:#Morning duet – the most commonly heard vocalization of the pair, singing in duet, complex and utilized to defend territory; it is interchanged with neighboring groups as counter-singing
#Danger peep – various soft, high-pitched peeps but sometimes low intensity, advising of danger; very difficult to localize
#Purr – sounds very much like a cat's purr; used by all members of the group to show contentment, affection or request for food, grooming or contact; rough growl – given by young animals when complaining of rain or when greeting adults
#Sharp scream – when fighting to express extra disgust
#Play growl – low, gargling growl used in play and changing in tone, terminating in interrogative tone
#Soft whine – especially young animals but also adults when requesting something of another such as food or while grooming another
#Bark – loud, sharp and sudden bark when molested by the unwelcome close presence of other larger primates such as ''Lagothrix'', ''Cebus'', ''Ateles'' or raptors.
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