xenops (rainforest bird from americas),
xenarthra (an order of mammals that include: anteaters, sloths, armadillos),
xaliney (member of cat family),
rare xylophone fish of Bora Bora,
xami hairstreak (butterfly),
Xiaosaurus
Some dinosaurs that start with s are Supersaurus, Spinosaurus, and Stegosaurus.
There are five species of dinosaurs that start with a q: Qantassaurus, Quilingosaurus, Qingxiusaurus, Quaesitosaurus, and Quetzalcoatlus.
· Yangchuanosaurus
Brontosaurus
· Yangchuanosaurus
The first dinosaurs appeared about 230 million years ago.
* Xenotarsosaurus * Xiaosaurus * Xuanhanosaurus
· Carcharodontosaurus · Chasmosaurus
10 billion yeas ago.
apatosaurs
Allosaurus Apatosaurus Albertasaurus
yes, pterodactyl