Slow lorises use venom as a weapon in intraspecific competition

Area of Science:

• Zoology
• Animal Behavior
• Chemical Ecology

Background:

• Animals utilize diverse weapons, including morphological and chemical defenses, for survival and resource competition.
• Venom serves various functions, from predation facilitation to defense, with rare instances of intraspecific agonistic use across taxa.
• Nocturnal slow lorises (Nycticebus) possess venomous bites, causing severe wounds, but the function of this trait in wild populations remained unstudied.

Discussion:

• This 8-year study investigated wounding patterns, territorial behavior, and agonistic encounters in wild Javan slow lorises (Nycticebus javanicus).
• Findings indicate that venom is employed by both sexes, suggesting a role in defending critical resources such as territories and mates.
• The use of venom in intraspecific competition among slow lorises provides novel insights into the evolution and application of chemical defenses in mammals.

Key Insights:

• Javan slow lorises exhibit venom use for territorial and mate defense, challenging previous assumptions about its function.
• Both male and female slow lorises actively deploy venom in agonistic encounters, highlighting its importance in social dynamics.
• This research provides the first evidence of venom's role in intraspecific competition and resource defense within a wild primate population.

Outlook:

• Further research can explore the specific composition and delivery mechanisms of slow loris venom.
• Investigating the long-term consequences of venomous bites on social hierarchies and reproductive success is warranted.
• Comparative studies across different slow loris species could reveal evolutionary patterns in venom use and its ecological significance.