I think birds.
Birds
According to the diagram you posted, birds are direct descendants of dinosaurs; crocodiles are cousins.
Yes, various scientific and news articles, literature, documentaries, etc. have been spreading more or less detailed information since long. But there are still lots of open questions, missing "links" and assumptions or theories ...
Some general information:
https://en.wikipedia.org/wiki/Paleontology
https://en.wikipedia.org/wiki/Dinosauromorpha
https://en.wikipedia.org/wiki/Archosaur
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