In the south, almost every month visible breeding bird sparrows.
在南方，几乎每月都可见麻雀繁殖雏鸟。
This paper summarize the effects of breeding bird and hatching egg and hatching condition on hatchability.
本文综述了种禽、种蛋和孵化条件对孵化率的影响。
Lack, however, suggested that clutch size—the number of eggs a bird lays per breeding cycle—is far below the potential limit of egg production.
然而，缺乏情况表明卵的大小——每一个繁殖周期下的蛋的数量——远低于产蛋的潜在限制。
One of 17 spoon-billed sandpiper chicks that have hatched in a captive breeding scheme to bring the bird back from the brink of extinction.
宽嘴鹬 人工繁殖计划17只已孵化雏鸟中的一只，该计划为了拯救濒临灭绝的宽嘴鹬。
In spring some5, 000 breeding pairs of the endangered bird leave western Mexico to build their nests in shin oak trees on the Fort Hood military base in Texas.
每年春天，约有5000对处在繁殖期的这种濒危鸟类离开墨西哥西部，前往德克萨斯州明德堡军事基地，在灰橡树中筑巢。
They found that, over the course of the breeding season, deserting the nest once eggs had been laid boosted the number of descendants produced by the bird that fled.
鸟类学家们研究发现，在整个繁殖季节的过程中，雀蛋一产下就弃巢而去的行为提高了这些遗弃巢穴的山雀的产雏量。
To determine if the bird is pure breeding it should be mated to a white or yellow.
要确定是否是纯种繁殖鸟应该搭配的是白色或黄色。
In spring some5,000 breeding pairs of the endangered bird leave western Mexico to build their nests in shin oak trees on the Fort Hood military base in Texas.
每年春天，约有5000对处在繁殖期的这种濒危鸟类离开墨西哥西部，前往德克萨斯州明德堡军事基地，在灰橡树中筑巢。
Researchers have found in Afghanistan the first known breeding area of the large-billed reed warbler, which was dubbed in 2007 as "the world's least known bird species."
在阿富汗发现第一个巨喙苇莺养殖场，这种鸟在2007年被研究人员定名为“世界最不知名的鸟类”。
It is the breeding ground of almost 100 species of birds, many of which are rare or endangered. Some 80 other bird species migrate and seek refuge there every winter.
有约100种鸟类在这个保护区内生活繁衍，其中许多是稀有濒危鸟类，另外还有大约80种侯鸟每年到这里过冬。
It is the breeding ground of almost 100 species of birds, many of which are rare or endangered. Some 80 other bird species migrate and seek refuge there every winter.
有约100种鸟类在这个保护区内生活繁衍，其中许多是稀有濒危鸟类，另外还有大约80种侯鸟每年到这里过冬。
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