Wouldn't count on accurate info from gamereviewers sites. Some reviewers just get 30 minute playtime with the game, and they base they review on those few minutes. or just watch the E3 demo.
Btw, Wildlife Imprisonment Simulator not the best way to start a review.

Most likely they mistaken some species: Baboon -> Mandrill, Thompson's Gazelle or Nyala -> Dik-Dik, Alligator -> Gharial.
Seen this article pop up multiple times, mostly accompanied with a conspiracy theory, "proving" Frontier didn't release all species in the base-game and want us to pay for "base game" animals.