Officials at Port Lympne were delighted with the new arrival, especially as black rhinos are known for being difficult to breed in captivity.

林姆尼港的官员们对新生命的到来都感到十分开心，特别是因为黑犀牛以难以圈养而闻名。

youdao

Giant panda cubs are rare, as it is hard to get pandas to breed in captivity.

由于圈养的大熊猫繁殖能力不强，所以大熊猫幼仔是极为罕见的。

youdao

It is susceptible to various diseases, and, up until recently, it has been almost impossible to breed in captivity.

熊猫容易感染各种疾病，直到最近，它一直都很难通过人工饲养繁殖。

youdao

"We know very little about hagfish reproduction, and no-one has ever gotten hagfish to breed in captivity - amazing as that sounds, " says Douglas Fudge, who heads the Guelph research project.

BBC: Hagfish slime: The clothing of the future?

Under the auspices of a foundation co-ordinating zoos across the globe, these seek to breed animals in captivity and reintroduce them (and their much-needed genes) into the wild.

ECONOMIST: From zoo cage to modern ark

He wants to breed southern bluefin in captivity, rather than just fatten them up in cages.

FORBES: The Future Is Fish