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为什么袋鼠好像一直在怀孕 – 译学馆
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为什么袋鼠好像一直在怀孕

Why Female Kangaroos Are Nearly Always Pregnant

雌性袋鼠可以一直怀孕
NARRATOR: Female kangarooscan be perpetually pregnant.
它们有三个独立的阴道和两个子宫
They have three separatevaginal canals and two uteruses,
使其能够同时养育三个袋鼠宝宝
enabling them torear up to three joeys at a time
雌袋鼠可以同时经历妊娠期和哺乳期
in overlapping states of gestation and nursing.
袋鼠妈妈受孕后
Once conceived, ajoey will only spend
袋鼠宝宝只会在子宫里待31-36天
31 to 36 days of the uterus.
在那之后 这只尚处于胚胎期的幼崽就会出生
After that, the joey,still an embryo, is born.
它出生时 只有一颗软糖那么大
At birth, he is only thesize of a jelly bean.
只有前腿 没有眼睛和耳朵
With just his front legsand no eyes or ears,
幼崽必须历经六英尺的长途跋涉
he must make the six inchtrek
穿过母亲的皮毛 到达育儿袋
through his mother’s fur to her pouch.
这段重要的旅程通常历时三小时
This important journey usuallytakes about three hours.
一旦安全进入育儿袋
Once safely inside thepouch,
袋鼠宝宝会找到奶头 紧紧咬住
the joey finds a teat and latches on,
直到34周后才会松开
not lettinggo for up to 34 weeks.
它们大部分的发育阶段在育儿袋里完成
It is here that most of hisdevelopment takes place.
刚出生的袋鼠宝宝到达育儿袋
Once the newborn Joey hasmade his way to the pouch,
那里可能还处于哺乳期的其他小袋鼠
his older sibling, whomay still be nursing,
就无法再进入育儿袋了
is no longer allowed inside.
这注定是一个坎坷的过程
It can be a bumpy transition.
这段时间里
During these times
袋鼠妈妈不仅育儿袋里有一个胚胎
when themother kangaroo has both an embryo in her pouch
脚边还有一只正在哺育的幼崽
and a nursing joey at her feet,
袋鼠妈妈能够分泌两种不同的乳汁
she produces twodifferent types of milk
同时满足后代们的需要
to meet the needs of bothdeveloping offspring.

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袋鼠妈妈们的小秘密

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