This answer raises 2 problems: (A) The early evolution of archosaurs is still very poorly understood – large numbers of individuals and species are found from the start of the Triassic but only 2 species are known from the very late Permian (Archosaurus rossicus and Protorosaurus speneri); (B) Crocodilians evolved shortly before dinosaurs and are closely related to them, but are cold-blooded (see below).
Ovaj odgovor postavlja dva problema: (A) Rana evolucija arhosaura je još uvijek vrlo slabo istražena - veliki broj primjeraka i vrsta je pronađen s početka trijasa, ali su samo dvije vrste pronađene u stijenama iz kasnog perma (Archosaurus rossicus i Protorosaurus speneri); (B) Krokodili su se razvili malo prije dinosaura i u bliskom su srodstvu s njima, ali su hladnokrvni (vidjeti dolje).