Play fighting versus real fighting in piglets (Sus scrofa): Similar patterns, different structure.

Area of Science:

• Ethology
• Animal Behavior
• Comparative Psychology

Background:

• Distinguishing between play-fighting and real-fighting in animals can be challenging.
• Piglets (Sus scrofa) may use play-fighting as a substitute for aggression.
• Understanding structural differences is key to deciphering the function of play-fighting.

Purpose of the Study:

• To investigate the structural and ecological differences between play-fighting and real-fighting in piglets.
• To determine if play-fighting in piglets exhibits distinct characteristics compared to aggressive fighting.

Main Methods:

• Video recording of 496 interactions from three piglet litters.
• Video analysis to extract data on duration, patterns, and involved individuals.
• Calculation and comparison of structural and ecological indices for play-fighting versus real-fighting.

Main Results:

• Play-fighting sessions in piglets were longer, more symmetrical, and more variable than real-fighting.
• Play-fighting exhibited less pattern repetition compared to real-fighting.
• Indices for polyadic interactions and distribution (Pielou's index) were comparable between play- and real-fighting.

Conclusions:

• The extended duration, increased variability, and symmetry of piglet play-fighting suggest it serves functions like motor training and social assessment.
• Piglet play-fighting may not fully align with all theoretical play characteristics, possibly due to its fluid nature and potential to escalate or substitute aggression.