Cover of Carl Sagan’s The Dragons of Eden: A good example of bad science

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Carl Sagan was a wonderful writer. He wrote many amazing books for popularising science and also championed against pseudo-science prevalent in the society. Like many countless others Sagan’s works have inspired and fired imagination in me. Particularly he decimated the arguments made by Velikovsky in Worlds in Collision. Two of his books which deal with the topics of pseudo-science and anti-science are Broca’s Brain, Demon Haunted World: Science as a Candle in Dark. Sagan is most meticulous when explaining things, and adds disclaimers whereever they are necessary and needed.

When I was reading his book Dragon’s of Eden (a Pulitzer prize winner !) the cover of the book stuck me as unusual. The Wikipedia page says that the cover artist was Don Davis. The cover illustration shows a humanoid animal sitting below a tree (of knowledge?) in a serene landscape with a lake and few herbivored near it. Interestingly, and also problematically the cover also shows a variety of dinosaurs in the area as the hominid. This is rather unsettling. And it is definitely wrong. The dinosaurs for all we know, and Sagan knew this too well (for example, see Demon Haunted World), became extinct long before any humanoid forms came into existence. So showing them existing contemporarily is wrong, and factually incorrect science. This illustration goes against all that is known via fossil records that we have.
I wonder what made Sagan, who otherwise was skpetical and very particular, choose this wrong and factually incorrect illustration for the cover of his book, or that he did not have any say in choosing the cover of the book?