Don't challenge this guy to a thumb war unless you want to lose an eye.

One, two, three, four, I declare a thumb war. Wait.... I'VE CHANGED MY MIND BACK OFF PLEASE NO

This guy is always giving you a thumbs up, no matter what.

Little Jack Horner
Sat in a corner
Eating his Christmas pie.
He stuck in his thumb
And pulled out a plum
And said, "What a good boy am I!"

I was playing on the island map, and I got a high level one that I named Iggy. After some leveling Iggy was at level 203. I had a Ptera, but Iffy was way better. I went away for a bit, and when I came back to base I got the message: "Your Iggy - Level 203 has been killed by a Dilo - Level 100"
I went full speed back, and I sicked all of my tames on that Dilo. Since then, I have played on two different maps. Each time, when I see an Iguanadon, I check the level immediately. They are so hard to find. I did find a 120, but it got killed by a Carno.
So 10/10 would tame again. Assuming they don't get killed by a lowly dilo while its on passive...