Chickens are from Superorder Galloanserae, which split off from Neognathae 85 million years ago. Hawks are part of “Neoaves”, an entirely different superorder that split from Neognathae around the time of K-T extinction event. While it’s theorized that the first placental mammals divered about 100-85 MYA, there are no known placental mammal fossils from before […]