The article is actually really interesting and has a lot more up-to-date information than the title would suggest. For example, one new idea I gleaned from this is that the evolution towards smaller body size happened long before the extinction event 65 million years ago. Miniaturization stretches back at least 200 million years. Other neat fact: early birds looked very much like infantile or even embryonic raptors, suggesting that instead of evolving a whole new set of traits, small modifications to embryonic development were more likely. It seems this idea is also picking up in other areas of studying evolution as well.