icthyornis
hesperornis
didelphodon
xiphanctinus
arcelon
dromaeosaurus
elamosaurus
mosasaurus
quetzalcoatlus
maiasaura
tyrannosaurus
albertosaurus

Can you tell David is on a dinosaur kick? Did you know they've found and named many many more dinosaurs than when we were his age? I feel like I chewing on rocks as I try to read these books.