How many fingers do birds have?
I read in embryonic stage the bird(  I forget who) has 5 then 2 degenerate and 3 finger  remain.  Does this degeneration occurs in all birds?

see
http://rspb.royalsocietypublishing.org/ … 8/20140765
http://www.livescience.com/12808-dinosa … ution.html
http://www.alphagalileo.org/ViewItem.as … ureCode=en