Discovered by outsiders in 1979, the crested iguana's Numbers are rapidly dwindling due to the brisk spread of introduced species, such as feral cats and black rats.

冠鬣蜥自1979年被来自岛外的人们发现以来，由于随之引入的例如野猫和黑鼠等外来物种的迅速蔓延，他们的数量正在急剧缩减。

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Recruited to deal with a rodent problem - black rats have been seen bolting across the Downing Street lawn - Larry has preferred hanging out in the corridors of power to stalking in the grass.

有人见过在唐宁街的草坪上冲出过黑色的硕鼠，拉里受聘于处理啮齿之患，相比于在权力走廊上闲逛，拉里更喜欢在草地里潜近目标。

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Objective: to study the activating blood and hypolipidemic effects of black mulberry on aged rats.

目的：研究黑桑椹对老年大鼠的活血降脂作用。

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Commerce was already associated with infection during the Black Death, though it would be hundreds of years before rats were singled out as its carrier, and the first quarantines followed soon after.

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They wanted to test how quickly the rats figured out that white was a good thing, while black passages were to be avoided.

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The Black Watch first fought in Iraq in April 2003 as part of the 7th Armoured Brigade, which led the Desert Rats' attack on Basra, the country's second city.

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