Forerunner fauna and flora
From Halopedia, the Halo wiki
Summary
Native Lifeforms to Halo, possibly only Installation 04. They are both bipedal and quadreped in stature, and somewhat resemble Earth's dinosaurs. These animals are only found in the Halo E3 2000 Trailer. However, the smaller one has been identified as a Blind Wolf in the DVD.
Although they did not make it to the final cut of the game, this does not exactly mean they aren't part of Halo as a whole. Engineers for example didn't make the final cut of Halo either, additionaly they were actually depicted in the Halo Novels. So who knows if these animals are meant to be there, and just unseen. They seem to have been created just to add some more depth to the Halo Mythos.
Images
File:HaloDinosaurs3.jpg
File:Halo Dinosaur 1.JPG
File:Halo Dinosaur 2.JPG
