Dinosaurs seem strange, but that is just because we are mammals biased toward assuming the modern fauna is familiar and normal, and past forms are ex… - Gregory S. Paul

Novelist Michael Crichton wrote Jurassic Park as a screenplay option for the Steven Spielberg flick. I am ambiguous about Crichton’s body of work, as it includes dubious anti-scientific elements. But I can’t be too upset about a fellow who includes me in the acknowledgements of his bestselling novel. I ended up doing some preliminary studies of Tyrannosaurus and Deinonychus for the movie(s). These were significantly altered by Spielberg and Stan Winston and his effects team for copyright purposes. In the film, some of my skeletals show up posted on Sam Neill's (ak.a. Dr. Grant's) trailer wall. I was accidentally responsible for the avian term 'raptor' being improperly applied to dromaeosaurs. In another Hunteria paper and PDW, I synonymized Deinonychus with Velociraptor, which Crichton picked up on and shortened into the convenient handle 'raptor'. The movie was okay, but I will never forgive them for presenting Brachiosaurus as such a heavy limbed clunker. I had nothing to do with that. I thought it was too bad the potentially omnivorous brachiosaurs – which were unlikely to have been as placid as cattle – missed the opportunity to snarf up the bratty kids when they were up in the tree.

When it was assumed that birds did not evolve from dinosaurs, it was correspondingly presumed that their flight evolved among climbers that first glided and then developed powered flight. This has the advantage that we know that arboreal animals can evolve powered flight with the aid of gravity, as per bats. When it was realized that birds descended from deinonychosaurs, many researchers switched to the hypothesis that running dinosaurs learned to fly from the ground up. This has the disadvantage that it is not certain whether it is practical for tetrapod flight to evolve among ground runners working against gravity.
The characteristics of birds indicate that they evolved from dinosaurs that had first evolved as bipedal runners, and then evolved into long armed climbers. If the ancestors of birds had been entirely arboreal, then they should be semiquadrupedal forms whose sprawling legs were integrated into the main airfoil, like bats. That birds are bipeds whose erect legs are separate from the wings indicates that their ancestors evolved to run.

The dinosaur world I grew up in was classical. They were universally seen as scaley herps that inhabited the immobile continents. There was no hint that birds were their direct descendents. Being reptiles, dinosaurs were cold-blooded and rather sluggish except perhaps for the smaller more bird-like examples. They all dragged their tails. Forelimbs were often sprawling. Leg muscles were slender in the reptilian manner. Intellectual capacity was minimal, as were social activity and parenting; the Knight painting of a Triceratops pair watching over a baby threatened by the Tyrant King was a notable exception. Hadrosaurs and especially sauropods were dinosaurian hippos, the latter perhaps too titanic to even emerge on land, and if they did so were limited by their bulk to lifting one foot of the ground at a time. Suitable only for the lush, warm and sunny tropical climate that enveloped the world from pole to pole before the Cenozoic, a cooling climate and new mountain chains did the obsolete archosaurs in, leaving only the crocodilians. Dinosaurs and the bat-winged pterosaurs were merely an evolutionary interlude, a period of geo-biological stasis before things got really interesting with the rise of the energetic and quick witted birds and especially mammals, leading with inexorable progress to the apex of natural selection: Man. It was pretty much all wrong. Deep down I sensed something was not quite right. Illustrating dinosaurs I found them to be much more reminiscent of birds and mammals than of the reptiles they were supposed to be. I was primed for a new view.