The first is competitive, because they're looking for mates, and the second is cooperative, because if they're all vocalizing in sync together, it makes it really difficult for predators like coyotes, foxes and owls to single out any individual for a meal.
一つは競争です 交尾する相手を求めているのです 二つ目は協力です 皆で声を合わせれば コヨーテやキツネやフクロウのような 捕食動物が 個体を見つけ捕らえることが 非常に難しくなります