To access food sources or defend the territory,agonistic behavior,mostly in a form of ritualization,was frequently displayed. 为获得食物和保卫领域,黑颈鹤之间(或与灰鹤之间)常发生争斗,争斗的主要形式是仪式化威胁。
An agonist is a chemical that binds to a receptor and activates the receptor to produce a biological response. Whereas an agonist causes an action, an antagonist blocks the action of the agonist and an inverse agonist causes an action opposite to that of the agonist.