20210213 四只东蓝鸲 必应壁纸

东蓝鸲 四只东蓝鸲 这只矮胖的四人组在北卡罗来纳州的暴风雪中被困，是一群东蓝鸲，三种东蓝鸲中分布最广的一种。(另外两个是西部和山区。)东蓝鸲的分布范围很广——从加拿大南部到中美洲的落基山脉以东，再到大西洋和墨西哥湾。你可以在草地、森林空地、草地等地方发现它们。

所有的东蓝鸲都是洞巢鸟，这意味着它们在树洞里安家，在啄木鸟等大鸟腾出的洞里安家，以及在被称为巢箱的人工巢里安家。20世纪初，由于栖息地的丧失和外来物种的引入，在争夺筑巢洞的竞争中击败了东蓝鸲，导致它们的数量急剧下降，巢箱在帮助它们恢复数量方面发挥了重要作用。加入环保组织和热情的后院观鸟者吧。他们专门为蓝知更鸟搭建巢箱，为这些色彩斑斓的画眉提供必要的庇护。

这个成功的保护故事使东蓝鸲成为“大后院鸟类统计”的完美吉祥物。“大后院鸟类统计”是由康奈尔鸟类学实验室(Cornell Lab of Ornithology)和国家奥杜邦学会(National Audubon Society)赞助的一个在线公民科学项目，帮助监测野生鸟类数量。想参与吗?只要数一数你所在地区看到的鸟类，并在2021年2月12日至15日期间在网上分享结果就行了。观鸟快乐!

原文:

This chunky foursome caught in a North Carolina snowstorm is a group of eastern bluebirds, the most widespread of the three types of bluebird. (The other two are the western and mountain.) The eastern bluebird range covers a wide area—east of the Rocky Mountains from southern Canada down to Central America, then over to the Atlantic Ocean and Gulf of Mexico. You can spot them in grasslands, forest clearings, meadows, and the like.

All bluebirds are cavity nesters, which means they make their homes in the hollows of trees, in holes vacated by bigger birds like woodpeckers, and in artificial nests called nest boxes. Nest boxes played a big role in helping the eastern bluebird population rebound after a precipitous decline in the early 20th century due to habitat loss and the introduction of nonnative species that out-competed them for nesting holes. Enter conservation groups and passionate backyard birders. They put up nest boxes specifically designed for bluebirds that provided needed shelter for these colorful thrushes.

This conservation success story makes the eastern bluebird the perfect mascot for the Great Backyard Bird Count, an online citizen science project sponsored by the Cornell Lab of Ornithology and the National Audubon Society that helps monitor wild bird populations. Want to participate? Just count the birds you see in your area and share the results online between February 12-15, 2021. Happy birding!

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