[ZX12R]

There was one branch of the dino family that became birds. Other branches didn’t. The bird branch was the one that survived whatever killed off the other dinos.

I see. The one branch took to the sky, and the rest stayed on the ground and ate each other to extinction.

[gleeaikin]

I decided to Google the big bird issue and found this interesting link regarding the shift from few carnivorous mammals to higher numbers after the KT extinction. Also the large bird I mentioned was Gastornis in the Palecene, followed by equally large Miatryma in the early Eocene (illustrated). SC this is a nice link and might deserve a separate ping post.

http://www.paleocene-mammals.de/predators.htm