This is true and false, in the original Carnivores, it was widely rumored that there was a secret, unlockable Brachiosaurus and Seismosaurus (whether it's one or the other, or both, depends on what you're reading). However, there aren't any files for either animal amongst the game's files, and an examination of Carnivores 2's source code (which was built directly on Carnivores') proves that neither animal was ever included in the game, regardless if their inclusion was planned. In addition, no one has ever come forth with definitive proof that they've unlocked either of the animals.
Brachiosaurus was, however, included in Carnivores 2 as an ambient animal usually found near water.
A closely related myth is that Brachiosaurus cannot be killed, or that it can only be killed by being shot in the rear with an X-Bow. Again, this is both true and not true - Brachiosaurus can be killed by any weapon if shot enough times, but its file has no death animation and it has no death sound, so the only indication that it has died is that its information is no longer visible in the binoculars. In addition, it has a very high health (1024, whereas most of the other animals have health less than 30 or so), so it takes a lot of shots to kill it.
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