That done, one stressed and one relaxed junglefowl were pitted against each other in a pen with only one feeder.

• 完成上述实验后，研究人员将一只受应激的红原鸡和一只自由自在的红原鸡放入同一鸡舍，两只红原鸡为此要争夺一个喂食器；