Avian maternal response to chick distress

Area of Science:

• Animal Behavior
• Neuroscience
• Evolutionary Biology

Background:

• Empathy, the capacity to be affected by another's distress, is crucial for social interactions.
• Parental care is a likely evolutionary driver for empathy.
• Understanding empathy in non-primate species provides insights into its evolutionary origins.

Purpose of the Study:

• To investigate empathy in domestic hens by observing their response to aversive stimuli directed at their chicks.
• To determine if hens exhibit specific behavioral and physiological changes when their offspring experience distress.

Main Methods:

• Domestic hens and their chicks were subjected to controlled conditions: control, air puff to chicks (APC), air puff to hen (APH), and control with noise (CN).
• Behavioral observations (alertness, preening) and physiological measurements (eye temperature, heart rate, vocalizations) were recorded during pre-treatment and treatment periods.
• A counterbalanced design with two replicates ensured robust data collection.

Main Results:

• Hens exposed to APH and APC treatments showed increased alertness and decreased preening behavior.
• A significant reduction in eye temperature was observed in hens during APH and APC treatments.
• Increased heart rate and maternal vocalizations were specifically noted during the APC treatment, even with minimal chick distress calls.

Conclusions:

• Domestic hens display specific behavioral and physiological responses to aversive stimuli directed at their chicks.
• These responses suggest that hens possess key attributes underpinning empathy, particularly in the context of parental care.
• The study provides evidence for empathy in birds, supporting its evolutionary significance beyond mammalian species.