Looking at how Frontier likes to cooperate with San Diego Zoo i wouldnt be surprised with american porcupine. Basing on current roster, frontier will always opt for their species and ask for informations about them. Some animals from game, that are not present in that zoo are simply ,,echo fighters,, made by frontier using their animals. Examples: aldabra tortoise(galapagos tortoise), dingo(singing dog), black wildebeest(blue).
Moral of history: animal u want is present in San diego? Great, it have higher chance to appear in the game.