[@Calle] Centaur and Lamia were mentioned, so yes, creatures representing fusions with animals are certainly allowed. If you mean pure fantasy animals like unicorns and Pegasus, they probably exist somewhere here too. 

You could make up your own type of tribesman if you wanted. All I ask is that they must coexists with nature. If it feels more foreign, like an extraterrestrial, you'll be asked to modify it. This guy wouldn't make the cut:

[img]https://leewoof.files.wordpress.com/2014/12/e_t_the_extraterrestrial.jpg[/img]