while they engaged in spontaneous aggressive interactions during a brief period of confinement; they found that head temperature dropped sharply in the few seconds prior to an attack, followed by an increase and then a more gradual decline back down towards baseline levels; aggressors were on average slightly hotter than recipients, but the changes in temperature were similar for both roles.
The birds were a mix of full-sibs, half-sibs and unrelated individuals that had hatched in artificial incubators from eggs collected from pens of freely mating polygynandrous adults. “In the wild, pheasants exhibit harem defense polygyny, with dominant males maintaining control of territories over a prolonged period. An individual adult male’s social rank strongly influences his mating success.”
“We expected that a fight would be more stressful for the pheasant on the receiving end of the aggression, and therefore that we’d see a stronger response in them.”
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