Experimental evidence for olfactory predator recognition in wild mouse lemurs

Area of Science:

• Primate Cognition
• Olfactory Ecology
• Behavioral Biology

Background:

• Primates possess advanced olfactory abilities, yet their capacity for recognizing predators via scent remains underexplored.
• Understanding olfactory predator recognition is crucial for assessing primate vulnerability and ecological interactions.

Purpose of the Study:

• To investigate olfactory predator recognition in wild mouse lemurs (Microcebus murinus and M. ravelobensis).
• To assess responses to olfactory stimuli from predators (fossa, barn owl) and non-predators (brown lemur, sifaka).

Main Methods:

• Two experimental setups were used: a systematic cage experiment and a two-way choice forest experiment.
• Behavioral indicators included time spent near stimuli, drinking duration, and a timidity score.
• Olfactory stimuli were derived from four distinct Malagasy species.

Main Results:

• Mouse lemurs significantly reduced drinking and proximity to fossa odor, indicating recognition.
• A higher timidity score was observed with fossa odor compared to non-predator and control stimuli.
• Complete avoidance of fossa odor was noted in choice experiments, unlike other stimuli.

Conclusions:

• Wild mouse lemurs exhibit clear olfactory predator recognition, specifically for fossa scent.
• Lack of avoidance for owl odor may relate to stimulus properties or predator type (aerial).
• Minor species-specific differences suggest ecological influences on olfactory recognition abilities.