Sharks

Shark's are fascinating creatures. They aren't exactly marsupials but they are some what.
Such as how the babies stay in the sacs in the mom's stomach until they hatch out.

This is a picture is a Horn shark egg
Here is the picture of the shark.






All shark sacs come in different sizes and shape.
I think the main reason for the sacs is to make sure the babies are safe but, if she dies they die.
My favorite shark was actually a prehistoric shark called Cretoxyrhina.