Is this why we like the look of grass?

New human gene in wallabies (Science Alert)

Here is a bit of odd information about the biology of kangaroos that comes at the end of this story about how genetic sequencing of wallaby genes shows up "surprising similarities" with human genes:

She said kangaroos and wallabies, like all marsupials, have many unusual biological characteristics. “They give birth to tiny under-developed young after a very short pregnancy, which is then followed by a long and sophisticated lactation period while in the mother’s pouch.

“This includes the simultaneous provision of two types of milk from adjacent mammary glands to offspring of different ages. This is like the left breast and right breast making milk of two completely different compositions," Professor Renfree said.

Neat trick.