Hen gives birth to chick without egg!

[downbeatplumb]

http://www.bbc.co.uk/news/17769677

A Sri Lanka hen has given birth to a chick without an egg, in a new twist on the age-old question of whether the chicken or the egg came first.

Instead of passing out of the hen's body and being incubated outside, the egg was incubated in the hen for 21 days and then hatched inside the hen.

The chick is fully formed and healthy, although the mother has died.

Evolution in action ?

Not unless the chick manage to also grow up to give live birth.

But if it did it could be the start of a new way of bird reproduction a new branch on the tree of life.
Even if it doesnt it gives an insight into how this could've happened in the mammalian line.