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Re: Lemurs and Feathers

In a message dated 6/19/01 4:44:01 PM EST, david.marjanovic@gmx.at writes:

<< IMHO these are examples of wrong questions (rather than wrong answers). It
 is of zero interest or importance to an animal that evolves wings for
 brooding what its descendants will or won't do with them millions of years
 later. Same for swimming. Or for lungs -- the _placoderm_ *Bothriolepis* had
 lungs and surely never came out of water. >>

OK, then. At what stage in the development of wings for brooding or swimming 
do they become exaptable for flying? And if a theropod has evolved wings for 
brooding in a terrestrial (versus arboreal) lifestyle, or for swimming in an 
aquatic lifestyle, when does it "decide" to "try out" its brooding wings for