Giant Prehistoric Terrible Birds would just roll off the tongue of someone who has trouble saying his own name in court.
There's a proper order that english adjectives are supposed to go in. Most native speakers instinctively understand it and people with low verbal-linguistic intelligence often fuck it up.
Its almost always: Quantity, opinion, size, age, shape, color, origin, material, purpose.
"Patrick drives a beautiful little 20 year old green American rust-covered mustang. He married his wonderful young boxy white lesbian wife."
"Joe sold his many excellent vintage Chinese plywood guitars. He needed the money because he was cut off by his ungrateful decrepit little pedophile brother."
There are exceptions (but usually only when this rule can be superceded by another grammatical or stylistic rule - a classic example is "big, bad wolf" which gets a pass because "bi..." and "ba..." conform to ablaut reduplication rules that are more rooted in how we construct vowel sounds as opposed to adjective order rules which probably evolved as a way of maximizing informational transfer while reducing cognitive cost)
There are few theories why this is. Its probably something to do with information locality relative to the noun the other words are describing or modifying. There have been a few studies in the last 10 years that used crazy maths I don't really understand to indicate how that specific order most efficiently reduces the entropy of possible nouns that could follow. There are lots of fat writers. Some of those fat writers are also stupid. Some are middle-aged, round, red and some are even from milwaukee, but only one is made from human shit and on a tireless mission to defeat the trolls.
Basically, the closer to the noun the information is, the less nouns there are that it could possibly describe, so deviating from that order creates cognitive processing costs that you could have avoided by not doing that. Not following this rule is a surefire way to unnecessarily obfuscate your own meaning. It's objectively, scientifically shit writing.
So if Patrick was slightly less of a retard, he would have written "Terrible Giant Prehistoric birds", and if he was even less retarded still he could have written, "Terrible Prehistoric Birds", or even "Prehistoric giant birds", or "terrible giant birds" because this rule is most consistently applied to sentences with an even number of adjectives, and is most frequently broken when dealing with groups of three.
He would probably argue that Tolkein criticised adjective order, but Tolkein was an Oxford educated philologist and Patrick is just a fat old useless retard.