This is a Miniature T Rex I folded 2 days ago. I used a 6″ single-side colored origami paper in this case, though. Again, you need a ‘thin’ origami paper to fold this model due to the intricate multiple creases involved.
Another point worth noting in folding this model is that, it is best to use a paper which is colored on both sides.
The size of the folded dinosaur can be adjusted by using a larger or smaller sized paper. It must be square shaped though.
What I think though, is that if one can get an appropriately printed paper, such as a wrapping paper or even if you can get your hands on a specially printed origami paper, one can make a realistic looking T Rex. The ‘claws’ and the ‘snub nose’ which you see in this folded model are optional creases and can be done without. But, adding them, of course, gives a nice ‘look’ to the dinosaur.
This model is from the book – Animal Origami for the Enthusiast: Step-by-Step Instructions in Over 900 Diagrams/25 Original Models
One can also follow the instructions to fold this TRex, by following this video: