Grooming behavior in the titi monkey (Callicebus torquatus).

Area of Science:

• Primate Ethology
• Behavioral Ecology
• Mammalian Social Behavior

Background:

• Grooming is a common social behavior in primates, serving various functions.
• The specific roles of grooming in Callicebus torquatus (titi monkey) social dynamics remain underexplored.
• Understanding grooming can provide insights into primate pair bonding and parental care strategies.

Purpose of the Study:

• To investigate the patterns and functions of grooming behavior in a family group of free-ranging Callicebus torquatus.
• To determine the role of grooming in parental investment and pair bond maintenance within this species.

Main Methods:

• Conducted 235 hours of direct observation over 18 days on a four-member family group of Callicebus torquatus.
• Focused continuous observations on grooming activity on the sleeping bough for 12 days.
• Recorded total grooming time, number of grooming bouts, and duration of each bout.

Main Results:

• Grooming sessions frequently comprised multiple grooming bouts.
• The longest grooming sessions were observed on the sleeping bough before dusk.
• Grooming time, bout frequency, and bout length were systematically recorded.

Conclusions:

• Grooming in Callicebus torquatus serves as a significant form of parental investment, notably by the male.
• This grooming behavior is essential for sustaining the monogamous male-female pair bond.
• Grooming contributes to the overall social cohesion and stability of titi monkey family units.