[Junior]

Considering current estimates put T. Rex in the 5,000 to 8,000 kg range, waiting for something to die to feed it -- even if it had a lower metabolism (while it may not have been warm blooded, it may have been semi-warm blooded and thus a tad more active than your average reptile) -- seems like a bit of a crapshoot when it comes to securing the next meal for such a really large animal. While I'm sure the average T. Rex wouldn't have turned down a carcass, or snagged another critter's kill, odds are he did a bit of hunting too.

[Oztrich Boy]

Don't most predators tend to be pack animals?

Trying to see a pack of T.Rex sating on a small carcase the happen to find.