Thanks for reading Sikander! You're right, it was one of my earlier stories. You can find the updated version of it here: https://medium.com/prehistoric-tales/t-rex-beyond-the-pop-culture-monster-f7fedc063e24

This lion roar does indeed remind the T.rex's one from the films. In fact the movie producers used a combination of a baby elephant's squeal, an alligator's gurgling, and a tiger's snarl to create this sound.