1. perhaps some genetic enagering gone wrong
2. coloneing gone wrong
3. a secesfull crosebreding of 2 animlas *a hyena and cyodie for ex. ther are storys of humans secfly doing it with chimps. one such stroy i know of takes place in china in the 1960s or 70s befor the culter rev. the animal was in some lab in central china, but was ramshaced by soldiers and destroyed, the crossbred animals died within 6 months of negelct*
4.some kind of lab illegaly doing experaments on animals *suchs as a privet companys lab* without aps aprovle
5. some new animal driven out of the woods or a defomation