"I found this interesting."
The message along with a link came through Instagram. It said the sender was my sister but the message made me suspicious. So, after verifying that she had indeed sent the link I proceeded to the video she passed my way.
The story came from the Cincinnati Zoo and told the story of a kangaroo who, even though she had a baby recently, and had not bred since that birth, had another joey growing in her pouch. It seems that when she was carrying the joey now known as Pocket she was also carrying another fertilized embryo.
Kangaroos have a superpower I never knew about. The mother kangaroo was able to pause her pregnancy. Wikipedia tells me it's called embryonic diapause. Once Pocket was out of the pouch and more independent, the paused embryo started to develop and eventually moved into the now vacant pouch.
My sister was right. That was interesting.