斑蝶

黑脉金斑蝶有一点特别有趣，那就是它们会迁徙，

What makes monarch butterflies particularly interesting is that they migrate ,

十亿只帝王斑蝶在墨西哥森林里冬�

A billion monarch butterflies hibernate in the forests of Mexico .

黑脉金斑蝶的数量降至历史最低点。

The population of Monarch butterflies is falling to record lows .

每一个地方都为数以百万计的黑脉金斑蝶提供了一个冬季的避难所。

Each side provides the winter home for millions of monarchs .

帝王斑蝶现象在此地发现的时间不过短短三十年

The monarch phenomenon was only discovered here around 30 years ago

长途迁徙是黑脉金斑蝶的天性。

Migrating long distances is in a monarch 's blood .

每到秋天，在加州和墨西哥，数以千计的黑脉金斑蝶都会向西飞去。

Each fall , thousands of butterflies head west in California and Mexico .

黑脉金斑蝶——一种大型黑橙相间的昆虫

Monarch butterflies , the large orange-and-black insects ,

黑脉金斑蝶的平均寿命只有9个月。

The average monarch lives about nine months .

大批从墨西哥迁徙来此的帝王斑蝶

of Monarch butterflies migrating here from Mexico .

每年的夏季末，黑脉金斑蝶就开始向南迁徙，

Every year in the late summer , monarchs begin their migration to the south ,

科学家们通过捕捉昆虫并在它们身上贴上身份标签的方式研究黑脉金斑蝶的迁徙。

Scientists learn about monarch butterflies migration by capturing and placing identifying tags on the insects .

它和其他帝王斑蝶作伴

She joins other monarch butterflies

大桦斑蝶翅上的鲜橘红色，对于饥饿的猎食者具有警告的作用：这个昆虫有毒。

The radiant oranges of a monarch butterfly 's wings alert hungry predators that those insects are poison .

但是据我们所知帝王斑蝶只会来这里过冬

but as far as we know , this is the only place that monarchs are able to spend the winter .

黑脉金斑蝶春季和夏季在美国的海湾沿岸和五大湖区繁殖。

Monarchs breed in the spring and summer on the gulf coast of the United States and in the Great Lakes region .

基因作物可以抵抗除草剂，这样农民就可以用除草剂除掉马利筋，而马利筋是黑脉金斑蝶最主要的食物来源。

The gene crops are designed to resist herbicides and that 's allowed farmers to wipe out milkweed , which is the main food source for Monarches .

它们有的整个冬天都在香港停留，有的则只停留一段时间便继续南飞，例如虎斑蝶。

Some stay in these valleys for the whole winter , but some ( like the Common Tigers ) continue their southbound journey after staying for a few weeks .

每年春夏，在美国的许多地方都可以看到黑脉金斑蝶，它们在墨西哥中部度过冬季时遍布大片森林。

The butterflies seen each spring and summer in many parts of the U.S. , spend their winters in central Mexico , where they cover vast stretches of forest .

文中提供该属鉴别特征，世界种类名录及分布，中国绢斑蝶属分种检索表、形态描述和特征图、地理分布。

Furthermore , generic diagnosis , world checklist of the genus , a key to Chinese species are included , and Chinese species are described and illustrated in this paper with distribution and host data .

每年迁徙时，过冬的黑脉金斑蝶会占据50平方英亩的森林，可是现在它们只占了不到3英亩。科学家认为这与墨西哥自然环境的砍伐现象有关。

The wintering butterflies that used to cover up to 50 square acres on their annual migration , now occupy fewer than 3 acres of forest . Scientists think logging in the Monarch , Mexican habitat , has something to do it .