There are many beasts and creatures within the World of Arl and you can use them. The beasts are split into 3 main categories:
- Ridden beasts are things about the size of a horse and generally good for riding into battle
- Driven monsters are things with the mind of a dog which your drive them before you and set them on your enemy
- Awesome gribblies are also not all of one role but are awesome and generally rare and/or large
- Sentient creatures are somewhere between beasts and an IR, they cannot be bought but they can be befriended
Simply add them to a unit as if they were a sword or suchlike.
Of course, you don't find camels on a polar ice cap in the real world and it doesn't happen here either. Some creatures such as horses and pegasus are very common and are found all over the world but most are not. In these cases you must have a city in the correct area of the world to be able to recruit units with these creatures.