What is the spinosaurus predator?

Spinosaurus aegyptiacus is the largest known land predator. It was a member of the theropod dinosaur family.

It lived in what is now the Sahara desert 100 million years ago.

Being so large Spinosaurus wouldn't have had any natural predators. On occasion if Spinosaurus was weak and couldn't find any food it could be attacked by a large pack of Rugops which could bring it down.

The sail on Spinosaurus' back was its vulnerability. If a Rugops pack managed to make Spinosaurus to fall over and land on its back it would snap its vertebrate and therefor its spinal cord.

Hope that this is satisfactory.