We're very good at hiding bodies.
What bodies? I eat my victims, bones and all.
I didn't know you were a T. rex.
How do you type with those tiny little arms?
T...Rex? You mean those big, green things I ate a few million years back? I don't know where you thought I was one of them, I'm an elder thing from outside the realms your feeble consciousness can touch. Though, I will admit, you're far better food than they were...your brains are much, much tastier.
Why'd I leave behind so much evidence of their existence? I was feeling lazy that day.