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Sauropod eggs

        While reading all the postings on sauropod eggs, I started
thinking about the relation between the size of an animal and the
frequency of reproduction.  Just speculation here, but given the size of 
adult sauropods, isn't it likely that reproduction occured infrequently 
relative to, say, mice?  Is there a general correlation between adult 
body size (or even average life span) and the frequency of reproduction?  
And if so, would it be significant enough to make hatchling or embryonic 
sauropod fossils extremely rare?