A pack of deinonychus are gorging upon a tenontosaurus carcass. So far, life is good, until they're meal is interrupted. Deinonychus is a predator that gets a lot of respect, which is deserved, but there's a more fearsome predator Aptian and Albian N. America.
While it's not as big as T. rex or anything, Acrocanthosaurus is still a giant. This charcharadontosaur could reach lengths of 38 ft. and weight up to 6.8 tons, so no push over. While there are many features that make it interesting, the most well known are its tall neural spines, which we still don't know exactly what they were used for. Obviously the tail vertebrae were for muscles, but what about the rest? Why were those on the neck and back so huge? I predict a mixture of muscle attachment and fat storage. With lots of fat it could go without food for days, while with muscle attachment it could swing its head with more force and thus a more deadly bite.