nesting possibilities

["Pat Grant (Library: Serials Catalog" <PATG@vax2.concordia.ca>]

Is it known what sort of topography the North American ceratopsians
preferred for nesting?  For that matter, now that the "protoceratops"
eggs have been reassigned, are there any known examples of actual c.
eggs?

If the hadros and c's nested near to each other, at the same times,
the hadros might get some sphere-of-influence protection from the
ceratopsians (or vice versa, if the hadros had some nifty protection
we haven't figured out).

Another possible analog for the mass-nesting scenario is the high
arctic, where vast numbers of nesting ducks, geese, and other birds
face off against arctic foxes, carnivorous birds, etc., every summer. 
Many of the predatory birds migrate along with their food source, but
for whatever reason they don't become numerous enough to make a bad
dent in the prey numbers (AFAIK).

Pat