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bird IQ gives them extinction pass

I haven't been able to access the paper. I wonder if someone could tell me how bird smarts could have helped them survive with such a high diversity of lineages when their archaic relatives could not?
"We suggest that improvements in
cognition relating to telencephalic expansion may have provided neornithine
avian clades with an advantage over archaic lineages at the
Cretaceous-Tertiary boundary, explaining their survival and rapid
diversification in the Cenozoic."
From abstract of:

Milner, A.C., and Walsh, S.A. 2009. Avian brian evolution: new data from
Palaeogene birds (Lower Eocene) from England. Zoological Journal of the
Linnean Society 155(1):198-219. doi: 10.1111/j.1096-3642.2008.00443.x