But the above considerations may serve to show how widely it would differ from the pictures based upon any modern analogies.
One may well inquire why it is that no such gigantic carnivora have evolved among the mammalian land animals.

The largest predaceous quadrupeds living today are the lion and tiger.

The bears although some of them are much larger, are not generally carnivorous, except for the polar bear, which is partly aquatic, preying chiefly upon seals and fish.

There are indeed carnivorous whales of gigantic size, but no very large land carnivore.

There were, it is true, during the Tertiary and Pleistocene, lions and other carnivores considerably larger than the living species.