两条毛毛虫 - 未名空间MITBBS历史存档

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两条毛毛虫

两条毛毛虫# Animals - 动物园

g*e2012-12-07 08:12

1 楼

其实没有毛，叫习惯了，呵呵。帝王蝶的幼虫，天气预报说周一周二有可能零下，不知
道它们有没有问题？

h*h2012-12-07 08:12

2 楼

帝王蝶的？第一次看到模样。

a*a2012-12-07 08:12

3 楼

花纹很鲜艳。它们在睡觉呢吧

【在 g*****e 的大作中提到】

: 其实没有毛，叫习惯了，呵呵。帝王蝶的幼虫，天气预报说周一周二有可能零下，不知
: 道它们有没有问题？

h*h2012-12-07 08:12

4 楼

很奇妙啊：
The Life Cycle(s) of a Monarch Butterfly
Monarch butterflies go through four stages during one life cycle, and
through four generations in one year. It’s a little confusing but keep
reading and you will understand. The four stages of the monarch butterfly
life cycle are the egg, the larvae (caterpillar), the pupa (chrysalis), and
the adult butterfly. The four generations are actually four different
butterflies going through these four stages during one year until it is time
to start over again with stage one and generation one.
In February and March, the final generation of hibernating monarch
butterflies comes out of hibernation to find a mate. They then migrate north
and east in order to find a place to lay their eggs. This starts stage one
and generation one of the new year for the monarch butterfly.
In March and April the eggs are laid on milkweed plants. They hatch into
baby caterpillars, also called the larvae. It takes about four days for the
eggs to hatch. Then the baby caterpillar doesn’t do much more than eat the
milkweed in order to grow. After about two weeks, the caterpillar will be
fully-grown and find a place to attach itself so that it can start the
process of metamorphosis. It will attach itself to a stem or a leaf using
silk and transform into a chrysalis. Although, from the outside, the 10 days
of the chrysalis phase seems to be a time when nothing is happening, it is
really a time of rapid change. Within the chrysalis the old body parts of
the caterpillar are undergoing a remarkable transformation, called
metamorphosis, to become the beautiful parts that make up the butterfly that
will emerge. The monarch butterfly will emerge from the pupa and fly away,
feeding on flowers and just enjoying the short life it has left, which is
only about two to six weeks. This first generation monarch butterfly will
then die after laying eggs for generation number two.
The second generation of monarch butterflies is born in May and June, and
then the third generation will be born in July and August. These monarch
butterflies will go through exactly the same four stage life cycle as the
first generation did, dying two to six weeks after it becomes a beautiful
monarch butterfly.
The fourth generation of monarch butterflies is a little bit different than
the first three generations. The fourth generation is born in September and
October and goes through exactly the same process as the first, second and
third generations except for one part. The fourth generation of monarch
butterflies does not die after two to six weeks. Instead, this generation of
monarch butterflies migrates to warmer climates like Mexico and California
and will live for six to eight months until it is time to start the whole
process over again.
It is amazing how the four generations of monarch butterflies works out so
that the monarch population can continue to live on throughout the years,
but not become overpopulated. Mother Nature sure has some cool ways of doing
things, doesn’t she?
http://www.monarch-butterfly.com/

g*e2012-12-07 08:12

5 楼

多谢科普，从时间上看，这两条是第四代的？

and
time

【在 h*h 的大作中提到】

: 很奇妙啊：
: The Life Cycle(s) of a Monarch Butterfly
: Monarch butterflies go through four stages during one life cycle, and
: through four generations in one year. It’s a little confusing but keep
: reading and you will understand. The four stages of the monarch butterfly
: life cycle are the egg, the larvae (caterpillar), the pupa (chrysalis), and
: the adult butterfly. The four generations are actually four different
: butterflies going through these four stages during one year until it is time
: to start over again with stage one and generation one.
: In February and March, the final generation of hibernating monarch