Only "dinosaurs" are mentioned in the article, but nothing is said to exclude birds ("avian dinosaurs") of which there should have been plenty about in the late Cretaceous to which the amber is said to date.
http://www.nytimes.com/2011/09/20/science/20feather.html?hpw
http://www.nytimes.com/2011/09/20/science/20feather.html?hpw
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