NARRATOR: Female kangarooscan be perpetually pregnant.
They have three separatevaginal canals and two uteruses,
enabling them torear up to three joeys at a time
in overlapping states of gestation and nursing.
Once conceived, ajoey will only spend
31 to 36 days of the uterus.
After that, the joey,still an embryo, is born.
At birth, he is only thesize of a jelly bean.
With just his front legsand no eyes or ears,
he must make the six inchtrek
through his mother’s fur to her pouch.
This important journey usuallytakes about three hours.
Once safely inside thepouch,
the joey finds a teat and latches on,
not lettinggo for up to 34 weeks.
It is here that most of hisdevelopment takes place.
Once the newborn Joey hasmade his way to the pouch,
his older sibling, whomay still be nursing,
is no longer allowed inside.
It can be a bumpy transition.
During these times
when themother kangaroo has both an embryo in her pouch
and a nursing joey at her feet,
she produces twodifferent types of milk
to meet the needs of bothdeveloping offspring.