The Other World And Beyond is a somewhat complex world. There will be new facts on this every once in a while so yeah.
Maturity in The Second World:
Hybrids in the Second World all mature differently.
Kitsunes, griffins, phoenixes, snakes and mermaids mature like normal humans.
Male animals including dogs, wolves, dingoes, cats, cheetahs, birds, bears, tigers lions, dragons and foxes mature when they ejactulate at least once. Females mature after they go into heat.
Animals including rabbits, skunks, gophers, weasels, frogs, raccoons and lizards sleep more often until they mature. Right before maturity, they sleep for two days without waking up.
Animal Facts:
The griffins, lions cheetahs, lizards and dogs are now extinct while the dingoes, raccoons, mermaids and phoenixes are fairly new.
The phoenixes and dragons live in the sky, so they're rare to see unless they're out hunting. Where in the sky? No one knows.
Kitsunes and gophers are endangered. Kitsunes are endangered because they are more complex than other animals in more ways than one, and because the other animals are kidnapping and even killing helpless kitsunes. Gophers are endangered because other animals keep hunting them because most animals think that they're one of the many animals who can't transform.