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Re: giant toothed bird-species or genus that lasts 50 million yrs?

Yes, but what I am trying to ask is would an
"Apatosaurus firstuvus" as a species last 10's of millions of years before 
"secundus" came around - or a species very closely related such as eastern and 
diamondback rattlers - not rattlesnakes as a whole or a very large genus.
It would seem at first glance there would be a die-off/replacement of another 
species within the same genus?  

----- Original Message ----
From: Matthew Martyniuk <martyniuk@gmail.com>

Depends on the group. Many modern bird groups have been around for
that long or longer.