The amount of black protruding along the edge of the wing indicates that the flight feathers continue to develop at a rapid rate, but it isn't until the wing is spread that the state of development can be fully appreciated. Unfortunately it is not very well visible in these webcams. Other ones give a better look on the development of the flightfeathers. These two eyases are doing fine.
See for a detailed picture view of the development on this special page:
http://falcoperegrinus-froona.blogspot.com/2008/04/eyases-growth-and-development.html
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