The most iconic mass extinction in Earth history occurred around 66 million years ago, as rapid environmental destruction led to the extinction of around 75% of species, most famously the non-avian dinosaurs, and subsequently restructured terrestrial ecosystems. Debate centers on whether dinosaurs vanished abruptly while diverse and flourishing or were in long-term decline before the end-Cretaceous. Flynn et al. analyzed Alamosaurus fossils found...
