Crocodilians have undergone quite a lot of change over their millions of years.
From fast running land lovers, to herbivores to totally marine creatures to bipedal runners, more terrestrial hunters.
Don't let the classic idea about Croc's fool you... they have changed quite a lot.
Rodent like Mammals date from the same time as the classic croc.
We are in a poor place to establish a group... as the single surviving member of a once much wider lineage we are, sad to say, in a bad place evolutionarily speaking.
wa:do