In reference to the giant storm petrels of Mahoutokoro, it’s a large sea bird. A Wampus is an actual cryptid that is a Florida Panther or cougar like creature that has six legs. The reason why it was chosen by Isolts son is because its fast, strong and impossible to kill. Each house represented something and favored something. Horned Serpent represents the mind, favor scholars, Wampus: represents the body, favors warriors, Thunderbird: represents soul, favors adventurers, and Pukwudgie: represents the heart, favors healers.
Also there are a few other schools such as Koldovstoretz School in I believe Russia, Academy of Broom Flying, Wizard Academy of Dramatic Arts, and the Euro Glyph School of Extraordinary Languages.
Just thought I’d share some info with you.