The Brachiosaurus is a sauropod dinosaur from the late Jurassic to the early Cretaceous period. Brachiosaurus hasn't appeared in any official Zoo Tycoon game yet, but it does appear in several fan-made expansion packs.
For the first Zoo Tycoon, a Brachiosaur version was made by RSN.
The Brachiosaurus appeared in a fan-made pack called Jurassic Park Pack.
The Zoo Tycoon 2 version was made by Simba.