There's a comment at the end of the video, something along the lines of:
Our old image of dinosaurs as ruthless killing machines
may be wrong, [...] some of them were caring parents,
with teenagers and younger offspring; they may have lived
in herds; they could have been highly social.
That makes sense to me. There are evolutionary advantages to being social and sociability occurred in mammals in a relatively short time after the extinction of the dinosaurs. It would be pretty amazing if, in all the time the dinosaurs had, they never evolved to be social. Don't you think?
Just yesterday, I was watching a pack of Komodo Dragons ... well, eat the corpse of some mammal. It was a video - I didn't see it in real life. But the point is: they weren't eating each other.
As far as I know ALL carnivorous snakes and lizards are potentially cannabalistic, that's why herpetologists have to be extremely careful not to keep different sized snakes or lizards together.
