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>From the discussion I take it we're pretty confident that the terrain in 
which these fossil remains were found has remained relatively unchanged since 
the animals' internment?  How old is that lake?  Have the flora changed 
substantially in the intervening millions of years?  There may be some 
erroneous assumptions underlying hypothetical habitat scenarios and 
subsequent behavior speculations.  Archaeopterix could only be a "shore bird" 
if there was a shore there at the time...