78.3/79.0 = stegosaurus dossier on The Island Maps!

There are many good places to find and kill stegos and those places are beaches with lots of trees and jungles because due to its large body it can easily get stuck.
P.S. Works for taming too

don't hit a stegosaurus unless you are away from your house

It will attack you if you steal it’s eggs. If you get away from it, it will just go to your house and destroy it and all your stuff, so just kill it. A long range weapon is best.