The central tenet of the book is that paleontological art often defaults to "overly conservative" depictions that ignore the biological diversity seen in modern animals.
: This section features unique illustrations of known prehistoric animals. Notable examples include a camouflaged plesiosaur mimicking the seafloor and a sleeping Tyrannosaurus . All Yesterdays
: Instead of only drawing what the bones explicitly show, the authors use "informed speculation" to suggest plausible soft tissue features—like fat deposits, feathers, and wattles—that do not leave fossilized remains but are common in living relatives. The central tenet of the book is that