lets face it wandering around and looking and hoping you will see the Loch Ness raccoon is very boring. I know the games is trying for a realistic approach. In some cases yes it could work in a mmo. I think letting the animals mate and spawn is not a good realistic approach for a mmo. With a tracking skill you let the player track down animals.

Say i use my tracking skill... after 5-6 try es cause I'm at a low skill level. I get a message.. You find some raccoon poop. it looks fresh! There are some track's leading off to the north. after a few more skill uses and messages, Ive tracked down a small family of raccoons.

this is what the player See's more or less. but behind the scenes the games leading u to a place where the animals you are tracking will spawn up. this removes the letting the animals mate, which doesn't work in a mmo. It gives you a way to spawn animals for people to hunt.