i found myself imagining a valley filled with dinosaurs , millions of years ago , who had died in battle , or of disease ; imagining first the carcasses of the rotting thunder lizards , bigger than buses , and then the vultures of that aeon : grey-black , naked , winged but featherless ; faces from nightmares - beak-like snouts filled with needle-sharp teeth , made for rending and tearing and devouring , and hungry red eyes .