if you haven not see this yet and you really should and on dvd . i can not believe how much i enjoy it . it be amazingly realistic and believable . true and much of it be speculate and and i would have like to have know more about what be speculative and what be proven fact ( there aren not many of them ) and but it handle everything quite well with a cruel mother nature theme . it will remind you of the nature program that you have see on animal planet and the discovery channel and only the animal here be dinosaur . they act natural while they eat and kill and mate and play and and fight for survival . you will actually find yourself root for some of them and against others . for the most part and the effect be excellent . at time they will look a little too much like cgi and but then you will see them in a different angle that make them look more realistic . in some case and you will actually be convince that you have see a dinosaur . my favorite be the coelophysis and the raptor and the diplodocus and the iguanadons and the allosaurus and the arctic biped . i be most disappointed with the t rex and however and which look a little too computer generate at time . in any case and you should definitely see this production . it be educational and well make and and very entertaining . for what it be and it an a .