Some People Say "NO", But The Answer Is "Ye-

Nerd:Erm Actually, Yarnaby Cannot Survive Both Islands.

SHUT NERD. Anyway:Some People Say "No" But The Answer Is Yes.

So Yarnaby Needs 3 Things To Survive On Both Islands:Food, Territory & Harley Sawyer.

So For Food On Both Islands, He Can Kill Medium & Large Dino's For A Large Mount Of Meat.

I Know You Can Say He Can Hunt Small Dino's & Goats Too, But They Give Yarnaby 1 Bite. That's Too Low. But He Can't Go To Laggon. Because Of, You Guess It:"Mosasaurus"

And For Sorna, It Can Survive Too. Like Who Is More Scary? Yarnaby Or The Spino That Killed The Rex In JP3?