The captive birds were trained to weigh themselves on electronic balances.

笼鸟被训练得自行在电子秤上称体重。

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Experiments with captive Humboldt Penguins at Brookfield Zoo proved, for the first time, that the birds use scent to discriminate between close relatives and strangers.

研究人员对美国布鲁克菲尔德动物园圈养的汉波德企鹅进行试验，首次发现企鹅可以嗅出陌生者与亲戚。

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Newly hatched at Fossil Rim Wildlife Center in Glen Rose, Texas, this Attwater's prairie-chicken is part of a captive breeding program aimed at increasing the birds' Numbers in the wild.

在德克萨斯州的玫瑰谷，一只阿特沃特草原鸡刚刚在化石边缘野生动物中心孵化出来，这是一个圈养项目的一部分，该项目旨在提高野生鸟类的数量。

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The trust said money raised would be used to protect wild nests, feed underweight wild chicks, increase nest site availability and release captive-raised birds.

BBC: Race starts in west Cornwall to save rare wild macaws

Tests on captive vultures fed carcass flesh traced with the drug produced symptoms that were strikingly similar to those witnessed in sick birds in the wild.

BBC: NEWS | Science/Nature | Bird groups hopeful on vultures