I had an amazing book when I was a kid that I haven’t seen for decades. I was born in 1973, so it would have been published sometime in the 70s or early 80s. It was a large, slim encyclopedia- or reference-style book, but it was about all of the planets and what each of their creatures would look like based on the physics, chemistry, and gravity of the planets. It was very colorful and there were wonderful renderings of all of the would-be creatures. I believe it also listed what these creatures’ habits, diet, lifestyle, etc. would be like as well.

I hope you can help me find out what it is!