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The aquatic bird theory

[ Sorry about the subject line.  That was mine since Martin's was: 
  "Re: DINOSAUR digest 83".  I replaced with something that seemed
  appropriate to me.  I'm sure some of you will groan.  -- MR ]

Antoni Lacasa wrote:

> With regard to this it is also interesting to observe a significant
> porportion of Early Cretaceous fossil birds are related to aquatic
> environments...

Could this be simply the result of favourable conditions for fossilization?

martin