Sniffing behavior of semi free-ranging Barbary macaques (Macaca sylvanus)

Area of Science:

• Primate Ethology
• Sensory Ecology
• Mammalian Olfaction

Background:

• Olfaction is a crucial sense for mammals, particularly in foraging and social behaviors.
• While primate olfaction is recognized, it's less studied in catarrhines compared to other primate groups.

Purpose of the Study:

• To investigate the frequency and context of sniffing behavior in Barbary macaques (Macaca sylvanus).
• To determine how sex and age influence sniffing patterns in this species.
• To explore the role of olfaction in feeding and socio-sexual interactions.

Main Methods:

• Conducted focal observations on 48 semi-free ranging Barbary macaques (24 males, 24 females) aged 1-25 years.
• Recorded sniffing instances, categorized by context (food, social, sexual).
• Analyzed sniffing data in relation to individual sex and age.

Main Results:

• Barbary macaques sniffed an average of 5.24 times per hour, with over 80% directed at food.
• Younger individuals exhibited higher sniffing frequencies than older ones.
• Females directed sniffs more towards food, while males engaged more in social context sniffing, particularly anogenital regions.

Conclusions:

• Barbary macaques utilize olfaction extensively in feeding contexts.
• Olfactory cues, especially anogenital odors, may influence male mating decisions, though further research is needed.
• The study highlights the significant role of the olfactory sense in the daily lives of catarrhine primates.