The interesting thing from the article is that crocodiles are still evolving rapidly, but not diversifying! they seem to be successful in their narrow and specialist niche.
They're the last living non-avian archosaurs. We sure take crocodilians for granted.
https://bmcecolevol.biomedcentral.com/articles/10.1186/1471-...
That's how I first encountered him - he was interviewing John Carmack. The later episodes were disappointing, but I spent a year keeping an eye on the guest list. There were maybe 4-5 really good interviews in that year.
In Our Time is like those good episodes but with an extremely high signal-to-noise ratio and generally better.
https://www.bbc.co.uk/programmes/b006qykl/episodes/player
And note that when you click to an episode to see who the guests are (usually three professors or other experts on the given topic) there's also a reading list.
I guess it's similar to Joe Rogan's show in that it's a recording of people speaking.
Before the K-Pg extinction, Crocodilia was a pretty wide order, with many different species occupying multiple ecological niches, from herbivore crocodiles with teeth like cows', to cat-sized running crocodiles living in the desert. And during the K-Pg extinction, most of it disappeared with only a handful species remaining, occupying two really close ecological niches (semi-aquatic opportunist predators and semi-aquatic fish eater (gharial and galse gharial)).
And he contrasted this collapse with what happened to dinosaurs (also know as birds), which today still have thousands of species occupying almost every possible ecological niche.