Is this The Ultimate Mammal Family Tree

A couple of weeks ago the Australian ABC program Catalyst presented “The Ultimate Mammal Family Tree.”
Here is a clip…….“Imagine a family tree for all the mammals alive on earth today. What would that tell us about how we are all related?”

Go here to check it out the program but be sure to download the pdf chart
Web Page

If you can’t be bothered just download the pdf chart here
Chart download hi-res pdf 1.6mb

The very central part of that graph/picture/tree representing the original/earliest situation is empty and unlabeled.
I wonder what that means?
Can't figure that part out I guess.

Originally posted by wayno
The very central part of that graph/picture/tree representing the original/earliest situation is empty and unlabeled.
I wonder what that means?
Can't figure that part out I guess.

I don't know wayno. I watched the program it was very interesting. I guess there has not been many replies as it’s a simple down load hope more people than you have downloaded it.