No land mammal has ever come close to the size of these gargantuan dinosaurs.

Look at a dolphin's anatomy, and see a water dweller that has ''land mammal' woven through its very warp and woof'.

Elephants benefit from the largest brain of any land mammal compared to their size.

In desperation, they hunt the world's largest land mammal.

The auditory system of a land mammal typically works via the transfer of sound waves through the ear canals.