[1][2] The entry of each dinosaur species includes information on its size, age, distribution and anatomical characteristics.

Naish also thought that the book's value could have been improved with specimen numbers and scale bars next to the reconstructions.

[5] Several paleontologists, including Naish,[1][2] Brusatte,[5] Riley Black,[6] and Christopher R. Noto, criticized Paul's approach to dinosaur taxonomy.

[1][2][5] Some other taxonomic choices, such as the assignment of some genera to specific groups and the use of original clades (such as "minmids" and "paxceratopsians") also received some criticism.

Brusatte also questioned some statements in the book as verging too far into speculation, such as Paul's writings on dinosaur behavior.