蝉音了了
诗歌和蝉鸣
为犹他春游买的玩具，先在俺们村试验，周末去拍鸟，刚知道俺们村的一片荒废的玉米地是沙丘鹤的迁徙的驿站。到了那，鸟比人多多了，几百只，被几个人围观。和周边的人的玩具一比，俺的是小米加步枪的档次，下一个玩具目标出来了，700 mm 的炮筒。虽然步枪，还是放了几枪，对付着看。查 wiki，这沙丘鹤挺有来头，算得上活化石，和丹顶鹤很像，只是羽毛是浅灰色的。
Fossil record
Sandhill cranes have one of the longest fossil histories of any extant bird.[17] A 10-million-year-old crane fossil from Nebraska is said to be of this species,[18] but this may be from a prehistoric relative or ancestor of sandhill cranes, and not belong in the genus Grus. The oldest unequivocal sandhill crane fossil is 2.5 million years old,[19] older by half than the earliest remains of most living species of birds, primarily found from after the Pliocene/Pleistocene boundary some 1.8 million years ago. As these ancient sandhill cranes varied as much in size as present-day birds, those Pliocene fossils are sometimes described as new species.[20] Grus haydeni may have been a prehistoric relative, or it may comprise material of a sandhill crane and its ancestor.[21][22]
