飞行是鸟类最耗能的运动，他们维持胸肌和骨骼需要付出高昂的代谢代价。可是还有超过60种的鸟类主动放弃了飞行，成为“走地鸟”。是因为他们退化了么？还是他们有更精明的算计呢？ 在放弃了飞行能力之后，他们的基础代谢率大幅下降，节省下来的能量可以被投入到繁殖方面上。比如新西兰的几维鸟，他们蛋的重量能达到体重的25%，是现生鸟类里卵占比最大的物种。 岛屿是“走地鸟”的天选之地。在远离大陆的孤岛上没有哺乳动物或者其他的捕食者，飞行逃生和长途觅食的需求就消失了，他们原来沉重的飞行器官反倒是成了累赘。有研究显示，随着捕食压力降低，鸟类普遍出现了胸肌缩小、后肢变长的趋势，这是他们走向不飞性的过渡阶段。 还有一些鸟就演化出了“蹭饭”的绝活儿。像是牛背鹭，就会紧跟着大型食草动物的步伐，利用它们惊扰藏匿猎物的习性高效实现觅食。在我国陕西洋县，有研究发现，跟着牛群的牛背鹭的啄食率会提升一倍，移动成本反而降低了75%。随着环境变化，它们甚至学会了跟着拖拉机或者干脆入驻垃圾填埋场。 最复杂的合作是来自于黑喉响蜜鴷。它们在知道了蜂巢位置以后就会引导人类过来。咱们人类用烟驱蜂、用斧劈巢，留下的蜂蜡就是他们的收获。 进取不必拘泥于一种形式，找到适合自己的节奏，才是最好的生存之道。 BGM： 片头：Jams Blunt - You're Beautiful 片尾：椿乐队 - 晚风（先行版） 参考文献 Field Museum of Natural History. (2025). When Birds Lose the Ability to Fly, Their Bodies Change Faster Than Their Feathers. Evolution. Kiat, Y., & O'Connor, J. (2024). History of flight in dinosaurs and secondary flightlessness in birds. Proceedings of the National Academy of Sciences (PNAS). Wright, N. A., Steadman, D. W., & Witt, C. C. (2016). 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