Most interesting. If that’s true, claims that our behavior stems from challenges faced by our ancestors may need to be scrutinized. Our ancestors may not have faced the same challenges.
The researchers think the original animals preyed on protists or one-celled animals (a shell eat cell world?).
Note: Researchers: “It was clear from the start of the study that extinct species showed a different pattern, including species with many specializations not seen today. One such specialization is a feature known as heterodonty: regionalized differences in tooth size or shape.” Maybe the crocodiles had an arsenal of potential adaptations in their genes.