Elintha brought multiple creatures form planet Earth, including Humans, as a test to see if they could live in Synkrevon. Obviously, these 'tests' worked due to the fact multiple Earth creatures now reside in Synkrevon, some even creating subspecies by mating with the Native animals.
Earth animals brought to Synkrevon:
Wolves/Dogs Horses Bears Sharks/Whales/Dolphins/Multiple types of fish Owls/Eagles/Hawks Crows/Parrots Snakes Frogs Cows/Pigs Elephants