The Evolution of Crocodiles

Although they don't look it Crocodiles are actually more closely related to birds then they are to any other reptile. Turn the clock back and they both just look like crocodiles so why did crocodiles not change or have they?

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Sources:
https://www.ncbi.nlm.nih.gov/pmc/arti...
http://pure-oai.bham.ac.uk/ws/files/3...
https://royalsocietypublishing.org/do...
https://www.researchgate.net/publicat...
https://www.nature.com/articles/s4200...
https://www.researchgate.net/publicat...