There is an hypothesis that dinosaurs were already in decline before the Cretaceous extinction due to the evolution of blood-sucking insects: https://news.orego

There is an hypothesis that dinosaurs were already in decline before the Cretaceous extinction due to the evolution of blood-sucking insects: https://news.oregonstate.edu/news/insect-attack-may-have-been-death-knell-dinosaurs https://news.oregonstate.edu/news/insect-attack-may-have-bee...