This thing will NOT eat ANYTHING when you get the prompt to feed it. They also begin to drain health until they WILL DIE. Every time you hit Y to feed, you will dismount and you will drain taming effectiveness.
I've tried with big & small pens and without pens. Each of them ended the same way, dead horse.
You're better off waiting until you see one with a baby and murdering the parent to claim the baby. It's the only way I was actually able to get one.
I dare you to raise one!! They are savage if you got two high lvl parents (about lvl 140ish) and you get imprinting on it. The thing will become an adult with about 230% melee and basically one chomp any bronto!!! But on the down side you loose your job and your girlfriend
I was flying around the swamp at night and saw this massive black shadow, being the intelligent young man that I am I flew over to it on my pterodactyl because I had no clue what it was. Scariest 20 seconds of my life.