Red deer Cervus elaphus blink more in larger groups

Area of Science:

• Ethology
• Animal Behavior
• Wildlife Biology

Background:

• Animals balance vigilance for predators with other activities like foraging.
• Group living can reduce individual vigilance, as vigilance is shared among members.
• Traditional vigilance measures (e.g., head-lifting) may not accurately reflect true vigilance levels.

Purpose of the Study:

• To investigate blinking rate as a novel, non-invasive metric for animal vigilance.
• To determine if blinking rate correlates with group size in red deer.
• To assess the potential of blinking rate as an indicator of predation risk and stress.

Main Methods:

• Observational study of a captive red deer population.
• Measurement of individual blinking rates across varying group sizes (1-42.7 individuals).
• Analysis of the relationship between group size and blinking rate.

Main Results:

• Red deer exhibited increased blinking rates as group size increased.
• Higher blink rates correlated with decreased individual vigilance.
• This supports the hypothesis that blinking rate is a valid indicator of vigilance.

Conclusions:

• Blinking rate is a simple, non-invasive metric for assessing animal vigilance.
• Increased blinking signifies reduced vigilance, potentially due to shared vigilance in larger groups.
• This method can be valuable for monitoring animal welfare under varying predation risks or stressors.